Think I've suggested it before. But the forum experience would be GREATLY enhanced by the implimentation of a User CP, fitted with, above anything else, a subscription feature.
A subscription feature though link, has to be incorporated into the entire forum. That is, on each page the user has the option to subsribe to that thread.
The person will only be notified via a link to the thread in his/her CP, IF/WHEN the thread has been posted since, since the users last visit.
Its really handy. And in all the other forums I use. I spend as much as half of my time in my subscriptions. Its that convenient.
You really should get it going man. ^_^
as well as put a limit on the size of sigs - when you start to run out of space at least lol. But it would perhaps be more helpfull to do it sooner than later.