No. This is a change from X2 to X3.
Open Preferences | Colors - look at "MIDI Tracks"
In X2, you can specify the MIDI Track Background colors; in X3, you can't.
Yes, you can go through 14 steps to assign colors to clips, or . . . we could just have it like before where you set it up once and then it is automatic all the time after that. Even if you do change clip colors manually, they will still change back if you ever "Bounce to Clips."
Aaargh.