This doesn't even seem like a viable strategy. When you're on forms and you're discussing a topic you're interested in, you add that thread to your watch list.

This doesn't even seem like a viable strategy. When you're on forms and you're discussing a topic you're interested in, you add that thread to your watch list. You come back to the forum and check on updates for the threads you are participating in, no amount of sliding will hide that. And as long as you're not replying too late, you're not necroing, no matter how much the thread has slid. You'd have to play this game before a thread even kicks off. And the amount of posts before the thread pages? And how fast you'd have to make them? Hard to hide that.