Intentional necrobump.
It still irks me that we can't do this without having to resort to cheating our images with the yellow border. The code is already there; mixer tracks are happily indented to make room for the scroll bar once you have too many.
So, to that end, two very simple requests.
1. Allow themes to specify MCP indenting just like on the TCP. Throw a toggle into Preferences|Appearance|Track Control Panel if you want, since not everyone wants it.
2. Just to keep my OCD at bay, could we please allow the MCP Master to indent along with the tracks? I like having all my tracks the same height, but as soon as the scrollbar shows up my poor Master gets kicked to the curb.
This second suggestion would also be a great time to include another request that keeps coming up: Pinning the Master track (and/or multiple tracks) to the top of the arrange view even when you scroll down:
http://forum.cockos.com/showthread.php?p=1404739. I would love this on the MCP as well, at which point you could just have the scrollbar extend all the way under the Master and avoid any weird-looking gap.