[Velocd]

I don't think you can discriminate a hack based on its sexual
orientation (, j/k), but in terms of how such a hack can be done: it can't, since there is no logic involved.

Your members wont bother posting if they discover they have to reach X amount within 24-hours, unless they are really into whatever genre your forum possesses. Most of all, people are forgetful creatures, and if somebody accidentally forgets about this 24-hour notice, and is deleted, they will be irritated--and might even think they were banned. This kind of impression on your new members and guests isn't the best to have, so I say ditch your idea.