I would also welcome this ... in fact, I don't know how difficult it'd be, but I'd love to be able to have the ability to turn off signatures in either certain threads* or even forums.
Some of my members either don't *get* how to turn off their signature lines for individual posts--or they're too stooooopid.
*We have had condolence threads going for high profile members who lost their moms and/or brother, and many didn't turn off their signatures--offsetting their heartfelt words (IMO).
~Sue <<-- realizes you can't save everyone, but every now and then, it'd be nice to be able to try!