Func_Group (Ctrl+Alt+E) and "Select same type" (Shift+A) selection doesn't work.
In any more recent version of NetRadiant I've managed to get hold of Func_group selection doesn't seem to work. (I don't have the skills or knowhow to build the Git source for Windows so I apologise if this is not an issue presently in the Git version)
Select Func_Group (Ctrl+Alt+E) works in the Xonotic version of Netradiant from 2012 on their site. But Select type (Shift+A) does not.