I have attempted makign these Set Driven keys, but it doesnt seem to have the results I want. Its quite hard to explain why it doesn't work right, but i'll try.
I set the driven keys so that at 0,0,0 none of the thrusters are glowing. And at 0,5,0 the bottom one is glowing (and similar settings for all other thrusters). Since the space ship is going to be moving, it may be at point 5, 15, 5, and if want ti to move towards 0,0,0 the thrusters don't act correctly. Sure the thrusters against the ships movement die down, but it isn't untill it passes 0,0,0 that the thrusters supporting its direction light up.
Is their anyway to make it so that when the ship is moving in a direction (say +y) that a thruster glows more intensley REGARDLESS of its position in 3 dimensional space. And when it stops moving in the direction the Thruster stops glowing?