Thread:Feedback/Stopping bad signatures?/FT2

As commented off wiki. Custom sigs are a chance to be individual, and add useful links. They are rarely abused. The only issue here is that the signature is replicated across all contributions. I'd suggest custom signatures, but an option "show default signature" for blocks, which will kill any aspiring signature vandals cold.

Technically that would be a 2 bit flag for the user (bit 0 = sig set to default due to user choice, bit 1 = sig set to default by block setting; 00=custom sig, and 01/10/11 = show default sig).

My more serious observation is this means that past signatures are ephemeral; anyone can at a stroke, delete or change their past sigs entirely, leaving no evidence of them, whatever they contained. (Example abuse route: a vandal can post validly to many pages, and then "flash" an offensive sig, then revert it a second later, and odds are good no admin will see it; no user can show it via diff). Is that a concern?