A common quibble that I have when I'm running X11 on a Linux system is that there doesn't seem to be any X11-wide keyboard shortcuts for copying and pasting. Ctrlc and Ctrlv work fine across most Gtk/Qt applications, but when copying and pasting to/from a terminal emulator, Ctrlc and Ctrlv aren't viable options.
Some terms like gnome-terminal use shortcuts like CtrlShiftc/v, but this still results in an inconsistent copy+paste experience across applications.
OSX, for example, uses the Super/Command key to provide Ctrlc/v shortcuts that function across all OSX (sans X11) applications, and don't interfere with terminal emulators.
Is there any way of getting similar functionality under X11 on Linux?