Trying out PID controllers.
I only used the proportional function though. The other inputs resulted in some janky behaviour in previous test crafts, thus I opted to not use them here.

Trim to control local up/down.
VTOL to control local left/right.
Toggle 4 to revert back to standard Roll/Yaw controls.
De-toggle 8 to turn off all engines.

Control scheme inspired by FlyingPotato_131's MAK - 26 Solar Wind Fighter-Interceptor (www.simpleplanes.com/a/1G69Jp/MAK-26-Solar-Wind-Fighter-Interceptor). I used a portion of his code calculating for the the directional speed.
Design inspired by ASBE's LOW EARTH ORBIT DEFENSE INTERCEPTOR (www.simpleplanes.com/a/zxJ60o/LOW-EARTH-ORBIT-DEFENSE-INTERCEPTOR). I copied the exhaust nozzles.