I would suggest that you simply start a timer to update the limit of the channel when you get opped on the channel. Have the timer call an alias using the channel name as a parameter and have that alias check the number of nicks in the channel and add 10 to it. You would increase the limit by 10 - say every 10 or 15 minutes - regardless of how many nicks were in the channel at the time. You might even provide a way to detect a netsplit on your network and NOT reset the limit if you have detected a netsplit condition, but just unset the netsplit variable so that the next time you go to reset the limit, the alias will go ahead and set the limit. This is not necessarily all that simple to do, since networks vary so much in how they present a netsplit.
