I use gedit3 under Oneiric. The buttons Esc/<Ctrl>Q in current rgedit-plugin do not work in terms of canceling computation (for instance because I made an infinite loop by accident). The only way to cancel computation is to close and restart gedit. This is somewhat annoying since the bases of the code require some time for calculation. I know that I can save the workspace - but still, this functionality of working buttons is kind of a must in my opinion.
In any case, thanks for providing such a useful tool.