call specific ship in GM controlls

Do you mean spawn a specific enemy ship? Yes, just have that ship created when a certain key is pressed. Remember, if you give the ship a unique name and to not spawn another one until the first one is destroyed.

I don't see a Borg Tactical Cube on page you linked to. But here is a section of code from my upcoming mission script "The Ultimate Weapon." If the GM presses the 1 key this code will spawn a Torgoth Goliath, rename it a Trinax Battlewagon, wrap it in a generic object canned Trinax1.dxs, then increment a counter so that the next time the GM presses 1 a different Trinax Battlewagon can spawn. I hope it helps.

<event id_arme="Key Small">
<if_gm_key keyText="1"/>
<if_variable name="spawnsmall" comparator="EQUALS" value="0"/>
<set_variable name="spawnsmall" value="1"/>
</event>

<event id_arme="Add Small 1">
<if_variable name="spawnsmall" comparator="EQUALS" value="1"/>
<if_variable name="smallcounter" comparator="EQUALS" value="0"/>
<create type="enemy" use_gm_position="" angle="180" name="To16" raceKeys="Torgoth enemy" hullKeys="Goliath small" fleetnumber="2"/>
<set_ship_text name="To16" race="Trinax" class="Battlewagon" desc="Unknown propulsion type" scan_desc="Mass 650,000 metric tons. Power output 20 gigawatts, roughly ten times what Artemis can generate."/>
<create type ="genericMesh" meshFileName="dat/Missions/MISS_Module_Ultimate_Weapon/Trinax1.dxs" textureFileName="dat/Missions/MISS_Module_Ultimate_Weapon/ShipHull4.png" colorRed="0" colorGreen="0" colorBlue="0" x="99000" y="0" z="59000" name="16"/>
<set_object_property name="16" property="pushRadius" value="0"/>
<set_object_property name="16" property="artScale" value="1.0"/>
<set_variable name="spawnsmall" value="0"/>
<set_variable name="smallcounter" value="1"/>
</event>

k here is the text for the borg tactical cube

<vessel uniqueID="9902" side="99" classname="Tactical Cube" broadType="large">
<art meshfile="dat/Mods/ST_TNG V2/models/_B_TacCube.dxs" diffuseFile="dat/Mods/ST_TNG V2/textures/_B_TacCube.png" glowFile="dat/Mods/ST_TNG V2/textures/_B_TacCubeGlow.png" specularFile="dat/Mods/ST_TNG V2/textures/_B_TacCubeSpec.png" scale="8.06" pushRadius="750" />
<shields front="27000" back="27000" />
<performance turnrate="0.0032" topspeed="0.35" />
<beam_port arcwidth="0.3" damage="6" cycletime="5.39" range="1600" x="0" y="3.07" z="77.06" />
<beam_port arcwidth="0.3" damage="6" cycletime="5.39" range="1600" x="0" y="-80.4" z="81.93" />
<beam_port arcwidth="0.3" damage="6" cycletime="5.39" range="1600" x="80.06" y="80.5" z="81.93" />
<beam_port arcwidth="0.3" damage="6" cycletime="5.39" range="1600" x="-80.06" y="80.5" z="81.93" />
<beam_port arcwidth="0.3" damage="6" cycletime="5.39" range="1600" x="75.15" y="-38.06" z="81.93" />
<beam_port arcwidth="0.3" damage="6" cycletime="5.39" range="1600" x="-75.15" y="-38.06" z="81.93" />
<beam_port arcwidth="0.3" damage="6" cycletime="5.39" range="1600" x="37.74" y="1.34" z="81.93" />
<beam_port arcwidth="0.3" damage="6" cycletime="5.39" range="1600" x="-37.74" y="1.34" z="81.93" />
<beam_port arcwidth="0.3" damage="6" cycletime="5.39" range="1600" x="45.79" y="53.17" z="81.93" />
<beam_port arcwidth="0.3" damage="6" cycletime="5.39" range="1600" x="-45.79" y="53.17" z="81.93" />
<beam_port arcwidth="0.3" damage="6" cycletime="5.39" range="1600" x="0" y="3.07" z="-77.06" />
<beam_port arcwidth="0.3" damage="6" cycletime="5.39" range="1600" x="0" y="-80.4" z="-81.93" />
<beam_port arcwidth="0.3" damage="6" cycletime="5.39" range="1600" x="80.06" y="80.5" z="-81.93" />
<beam_port arcwidth="0.3" damage="6" cycletime="5.39" range="1600" x="-80.06" y="80.5" z="-81.93" />
<beam_port arcwidth="0.3" damage="6" cycletime="5.39" range="1600" x="75.15" y="-38.06" z="-81.93" />
<beam_port arcwidth="0.3" damage="6" cycletime="5.39" range="1600" x="-75.15" y="-38.06" z="-81.93" />
<beam_port arcwidth="0.3" damage="6" cycletime="5.39" range="1600" x="37.74" y="1.34" z="-81.93" />
<beam_port arcwidth="0.3" damage="6" cycletime="5.39" range="1600" x="-37.74" y="1.34" z="-81.93" />
<beam_port arcwidth="0.3" damage="6" cycletime="5.39" range="1600" x="45.79" y="53.17" z="-81.93" />
<beam_port arcwidth="0.3" damage="6" cycletime="5.39" range="1600" x="-45.79" y="53.17" z="-81.93" />
</vessel>

we also need commands for the following ship

<vessel uniqueID="78" side="14" classname="Maquis Ship" broadType="medium">
<long_desc text="Constellation Class Cruiser^An older quad cruiser design^8 beams, 4 Torpedo tubes^Stores for 2 nukes, 8 homing, 6 mines, 4 ECM." />
<fleet_ai commonality="45" />
<art meshfile="dat/Mods/ST_TNG V2/models/_F_Constellation.dxs" diffuseFile="dat/Mods/ST_TNG V2/textures/_F_Constellation.png" glowFile="dat/Mods/ST_TNG V2/textures/_F_ConstellationGlow.png" specularFile="ST-TNG_V2/Copy into Artemis/dat/Mods/ST_TNG V2/textures/_F_ConstellationSpec.png" scale="0.556" pushRadius="175" />
<shields front="1125" back="1125" />
<performance turnrate="0.008" topspeed="0.57" />
<beam_port arcwidth="0.3" damage="12" cycletime="13.19" range="1260" x="0" y="21.69" z="174.85" />
<beam_port arcwidth="0.3" damage="12" cycletime="13.19" range="1260" x="0" y="14.54" z="243.54" />
<beam_port arcwidth="0.3" damage="12" cycletime="13.19" range="1260" x="0" y="-22.66" z="170.19" />
<beam_port arcwidth="0.3" damage="12" cycletime="13.19" range="1260" x="54.82" y="21.43" z="120.31" />
<beam_port arcwidth="0.3" damage="12" cycletime="13.19" range="1260" x="-54.82" y="21.43" z="120.31" />
<beam_port arcwidth="0.3" damage="12" cycletime="13.19" range="1260" x="0" y="69.2" z="-132.34" />
<beam_port arcwidth="0.3" damage="12" cycletime="13.19" range="1260" x="0" y="-1.19" z="-97.38" />
<beam_port arcwidth="0.3" damage="12" cycletime="13.19" range="1260" x="0" y="-71.97" z="-134.2" />
<torpedo_tube x="0" y="64.03" z="-63.79" />
<torpedo_tube x="0" y="-65.99" z="-64" />
</vessel>

how can we adapt your code to fit those 2 ships

Change raceKeys="Torgoth enemy" into raceKeys="Borg enemy"

Change hullKeys="Goliath small" into hullKeys="Tactical Cube large"

I'm not certain that a two-word hulltype (Tactical Cube) will parse correctly, but see what you get. Also, my code is written in the context of the entire mission. Obviously I have many, many more lines of code to spawn more Trinax Battlewagons with unique names and descriptions. If you don't need unique names and you are using a custom vesseldata.xml file your code will be much simpler.