Please provide an option for getting rid of the "Mark all forums read" in the main window. I keep hitting it, instead of "view new messages in subscribed forums".

just don't click it ...

My brain goes to that button because it is by itself.
There is no way of undoing it once it is clicked.

Maybe a better option is an "are you sure" dialog, similar to emptying the trash on a computer.

that link is well set off from the get new posts link for just this reason...to put a warning in will slow many down who don't have trouble with this...take it slow a few times and after a dozen or so times you will condition yourself to avoid it..