The post count is a pretty good idea but the fact that you have to wait 4 hours is a little excessive. Most people will spend a certain amount of time on the forum when researching specific things at one time. They will stay on for lets say 2 hours and then they move away and then come back for another couple minutes and move away again. It's really frustrating.
Im hashing a nice gentle ~85Mhash/s. Its pretty slow but when time isn't an issue at the moment then its quite nice to have something like this to look at.