When pressing Ctrl-C and Ctrl-X with non English layouts (tested with Hebrew and Russian layouts) nothing happens (seletion isn't cut at Ctrl-X nor copied at Ctrl-C). I've noticed that Ctrl-Z and Ctrl-V do work with non English layouts. The copy/cut & paste keyboard shortcut is extremely usefull and it is not comfortable to switch to English layout every time.
geany 0.21 (built on Mar 19 2012 with GTK 2.24.10, GLib 2.31.20)
Ubuntu 12.04 3.2.0-26-generic x86_64