I just upgraded my Ubuntu from version 12.04 to 14.04, now with gedit 3.10. Previously I had managed to customize some shortkeys, e.g. block commenting to Ctrl+r and block uncomment to Ctrl+t (instead of the defaults Ctrl+m and Ctrl+Shift+m respectively). These settings did not survive the upgrade and I'm desperately trying to get them working again.
I've googled a lot on the issue, and the best I can find is listed below. I have run gconf-editor and checked the box "gnome->desktop->interface can_change_accels".
1) Close all running instances of gedit.
2) Open ~/.config/gedit/accels as root (with other editor than gedit, e.g. emacs).
3) Edit the relevant lines in the file, in my case (block commenting):
; (gtk_accel_path "<Actions>/GeditCodeCommentPluginActions/CodeComment" "<Primary>r")
; (gtk_accel_path "<Actions>/GeditCodeCommentPluginActions/CodeUncomment" "<Primary>t")
4) Save changes and close file.
If I look at the accels file (via e.g. the cat command), the changes are there. As soon as I open gedit however, the changes I made to accels are overwritten back to the defaults again. I found other posts with similar issues (the changes to accels are overwritten). Does anyone know of how to fix this to be able to customize the keyboard shortcuts?