One control that might be necessary is the ability to prohibit the use of a particular code in a signature. BBCodes are normally allowed in signatures, but someone who puts [power] into their sig, or [roll]50d1000[/roll] could generate a lot of server activity. If this isn't possible, the admin will just have to watch for such sigs, but it is important to note that. 100 people with factorials in their sigs is gonna be bad.
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