Honestly I still don't get why people strive for expressing their individuality with such cosmetic things instead of focusing on the gameplay/RP. It's like dyeing your hair green; may look fancy (not really), but won't change things much, you'll get tired of that after some time anyway.
Back in the days of prosperity of this mod people usually devoted themselves to something more useful than just having differently-coloured lights/engines/thrusters. Forgive me for my nostalgic words, though.
What comes to the change of the thruster speed, that's not acceptable. The current speed balance has lived for long already, we shall avoid any dramatic reformations.