What i heard is that Misc. is permenantly locked. what I do know is that it's still accessable. Nothing is foolproof, you see, to a significantly talanted fool.
I've run into this before with A2. The feature resets ALL hostile towns, including dungeons. I've done it to the Nephil outpost near the begining of A2, and all the nephil came back (I got treasure all over again too, but...)