Here are some of the non-standard hotkeys that apparently I'm going to have to learn (Windows user):
Closing a tab: not Ctrl-W, but Ctrl-F4. Not exactly non-standard, but Ctrl-W is so much more convenient.
Moving between tabs: not Ctrl-PageUp/Down, but Alt-Left/Right. What? Who else uses that?
Renaming a file: not F2 or Ctrl-R, but...Shift-F6? And copy is Shift-F5? Why??
Second day using RubyMine, so I'm learning I guess...