- 60D level indicator (Canon has one too)
Yes, please keep it - I added it on multiple display presets as an integrated, unobtrusive way to check the camera level on my 60d.
- Silent pics - advanced modes (I intend to keep only simple, burst and maybe matrix modes)
Please do keep the hi-res matrix mode, I was asking for that before on Google groups - I use it frequently to preview focus stacks without increasing the shutter count, at 20-30 pictures per shot this really does make a difference on camera bodies with 100-150k warranty cycles. Even if there's no way to prevent individual tiles or shots to exposing differently, please at least keep it as it is!
- Mirror lockup sync'ed with self timer (anyone using it?)
Yes, I'm using exactly this setting since it can't hurt to have the mirror lock up if the camera is on timer anyway.
- movie remap (sorry for that, I know it was very handy, but causes stability problems)
Noooooooo ... "handy" doesn't even come close, and I for one never had any problems with it on 60d :-(
Last not least: Thanks for asking before removing existing, please don't go the GNOME way and think that users are easily confused!