With the lighting thing. Do you mean it's hard to tell where one object stops, and the other begins?
If so I have the solution. Don't use the blank colors. Use textures. Any sort of texture as long as it's got some sort of blemishes on it. Heck, you could even make a transparent concrete overlay and apply it to all the colors. Make your own "concrete" color pack. :3
That's what I did :c
send me your .mis file and i'll have a look.
Maybe... Me and Boom checked out the problem and do not believe there to be a fix.