As the administrator of my forum, there are a lot of times I'd like to skip showing my signature on posts and replies of my choice.
Would like to see a check box near the submit button so you can skip the signature on a per post basis. I think a check box that is ticked to show signature as default. Just un-tick it to skip signature.
At the very least I'd like to see this for administrators/moderators but I think it would be useful for all users.