How about signature limits?
* Minimum Message Count = 20
Members minimum message count required to create a signature.
* Allowed Signature Lines = 5
The number of lines in a signature that is allowed
* Allowed Signature Links = 5
The maximum number of signature links that is allowed. After the limit has been reached, further links are stripped, anchor text remains intact
* Allowed Number of Images = 1
The number of images in a signature that is allowed.
* Max Chars in Signature [Including BB] = 500
The Maximum number of characters allowed in a signature (this includes characters from BB code
* Max Chars in Signature [Excluding BB] = 300
The Maximum number of characters allowed in a signature (this excludes characters from BB code)
* On saving a signature, if it break the rules, automatically it adds a message to the users signature pointing to the rules
(so mods don't need to explain why the signature was updated)