Actually, until I pestered PaulH about it a few days ago, the other options in the "search" page defaulted illogically as well. Instead of searching for "And" terms, it searched on "Exact Phrase". And instead of searching all posts, it only searched the most recent posts. That's now been fixed.
My argument is that even the topmost box should always default to "All Forums", because that's the most common type of search one would do even when buried in a thread. But it's a matter of personal choice, and right now it defaults to the current forum. I don't know if it's even possible to change the BBS code to offer it any other way, and it kind of makes sense the way it is now.
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Tony Fabris