Hi, this has probably been suggested a few times, but I come from another forum where you don't have to wait an amount of time to post again, and I think that system works very well. I know it could cause some spamming problems, but in the long run it would help people keeping their thread at the top of the forum.
The feature is called Flood Timer. We have it for security. It won't be removed. Also, stratergical bumping is the best way, rather than multiple ones.