I find this feature to be annoying, and there appears to be no way to turn it off. I am hoping this feature is not in vBulletin, however if it is, it would be nice if the same options were available there as well.

In really busy topics it becomes near impossible to post a reply, as someone will reply before you post, then someone else replied again after you chose to post anyway...which will re-invoke the feature again...and again...