What exactly do you mean?
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If you mean #1, use the Force Word Wrapping
hack, but it only works in posts
as far as I know.
If you mean #2, use the Restrict Images in Signatures
hack, which will let you prevent users from using images bigger than limits you specify in the ACP. You can also limit the number of images you want users to be able to have in their signature. Unfortunately, if you allow users to use more than 1 image this cannot prevent users from putting 2 images next to eachother that exceed the single image width limit, which can cause distortion.
If you mean something other than #1 or #2, can you give me an example?