I effed my signature :(

[A-Man]

Alternatively allow trusted members to use HTML in their signatures and stuff, which is also a lot of work, and introduces the problem that you do not know in whom you can trust. When can trust someone? Can you trust me? The only one that who knows you can trust me is me.

Eh, whether someone is "trustworthy" or not should not grant them special functional features in a forum.

tl;dr: Full or close to full HTML in signatures is and will always be unsafe. Kill it, add bbcodes as necessary.

Totally agree. One time I needed to use HTML was to add a table to my thread, and it wasn't available for security reasons. If that was the case with threads in which HTML could actually be useful, then it should be applied to its inferior in usefulness, signatures.