The first tool I'm releasing is RemoteExecute, it lets you run any program that's already on the device, supplying a path and any parameters. (e.g. \Windows\RegionCPL.exe)
It's currently only connecting to the first WP7 device it finds (not emulators) but it could connect to any device/emulator if I bothered to code an interface for it.
There's very little error handling, because this has sort of been whipped up in a hurry...
Anyway, it may or may not need a developer unlocked device (I don't know, I've only got unlocked ones) and it doesn't let you deploy anything at all. And you might need the real WP7 Developer Tools, but I can't test that.
Source code may be available if anyone wants it, but I'll need to clean it up a little...
Enjoy, and Merry Christmas!
Requires a developer unlocked device (Chevron should work for this purpose)