Use mouse wheel for part sizes

[KingD]

This should be pretty simple to add to the game. My suggestion is that you could simply use the mouse wheel up/down instead of moving the mouse while 'holding' the arrows you use to adjust part size/rotation. This would allow for much better control and also you wouldn't have to release the arrow and click it again when you reach the edge of your screen.

[pHanta]

You already can : just highlight the slider with your mouse then scroll to adjust.

[KingD]

You already can : just highlight the slider with your mouse then scroll to adjust.

You misunderstand, I'm talking about the cosmetic parts you use during body design such as lights and vents.