looks clean enough.. might want to back the trigger commands shorter though heh.. !hoppadd to !hadd or something shorter.. just to save the weary fingers and stuff..
only other stuff as a positive comment here... maybe instead of messaging the whole channel that you have added/removed a user, change it to echo -a so only you can see it, it the bot is on your pc that is....
will have a better look laters :) gets an initial 5