Threads are supposed to be sorted after last post date and not last bump, and that is how it will stay. We don't want you to say bump 24/7, if you have to maybe you should think twice before bumping your thread. Does anyone really want to view your thread, or for what other reason do you have to keep bumping your thread? Because if the content of your thread is interesting, it will automatically be bumped when someone responds. If not, the thread should be left to die and that's how it should work.