Windows 7 32 bit
AMD Radeon HD 7310M
Broken: Blender 2.72b win 32
Short description of error
Set Rotation Mode (Ctrl+R) has no menu item or operator in the tools region (well I cant find it).
Exact steps for others to reproduce the error
Heres a file with some armature bones, selected in pose mode:
There is an option in the 3d view properties region, to set the rotation mode for the active bone, though this doesnt set the rotation mode for the selected bones.
Ctrl+R sets the rotation mode for the selected pose bones, pretty useful.