Another suggestion which just occurred to me. Perhaps it is already implemented, but it appears not to be the case from what I recall. Regarding signatures, I would be best in my opinion if the default preference for all user groups was 'see all signatures'. I think the current default is to keep them hidden.
So if any of us have a signature, most people aren't going to see it, because only a handful people are going to change the preferences from the current default preference (to hide the signatures) to any of the other options.
Signatures are something that 99% of users want to see anyway. Most here are probably not even aware that anyone else any signatures, because most people don't mess with the default preferences. Also one wants lurkers to see the signatures as well. The whole point of the signature is that it be seen often and by many people.