FastBikerBoy
So the question is, can I select any clip and assign it a background color?
Yes, select the clip(s) and change the background via the clip inspector. Any other clips follow the colour settings from either default or those set by the new track colour widget.

Isn't that what I said But was told No-Can-Do in X3 (#38)?
I'm sooo confuuused.
I NEED X3!
Question: Can you do it by Right Click as in pre X series?