Open ‘gconf-editor’ Lookup the ‘apps/metacity’ folder. Open the subfolder “global_keybindings”and set “panel_run_dialog” to “disable”. Next set (in the same folder), “run_command_1″ to “<Alt>F2″ Now open (in “apps/metacity”) the subfolder “keybinding_command” and set key “command_1″ to “gmrun”. Now hitting Alt-F2 should get you gmrun, instead of the stock run dialog.