Thanks for the responses.
Let me phrase it this way...
If I enabled sig images (allowing users to use the [SIGPIC] code), I know that many will say "I want to see images in posts (using the [IMG] code), and I want to see signatures, but I don't want to see images in signatures (when sing the [SIGPIC] code)."
I would like it so they can go into their user CP and check a box that says "Do not display images in sigs".
Basically, I want the users to have the choice to disable seeing images displayed using the [SIGPIC] tag.
Clear as mud?