Did you check if the config files where there after the purge? What front end are you using?
I installed guake then purge it. The keybinding preferences were remove from the system but general and style preferences were still on the system Location of the preferences for gnome are and this is what was left behind after purge. Keybindings are missing :~/.gconf/apps/guake$ ls %gconf.xml general style >From the guake package it uses gconf2 for keeping track of its changes for the user. Installed-Size: 905 Depends: gconf2 (>= 2.28.1-2), python2.7, python:any (<< 2.8), python:any (>= 2.7.5-5~), notification-daemon, python-notify, python, libgtk2.0-0, python-vte, python-dbus, python-glade2, python-gconf, python-xdg, python-keybinder -- Regards Martin Naughton