I made it so that it uses the new default script "add2alias" to tack quotes onto the end of your current start_intermission native alias instead of completely taking it over. In this light, I also removed the automatic [say "gg"] in each quote, so you get to choose whether "gg" is automatically said (add2alias start_intermission [say "gg"]) or not.
EDIT: don't "CBA" to get your own quotes, though. :-P
EDIT: don't "CBA" to get your own quotes, though. :-P