I'm a newcomer to this forum, but LONG time OCRemix fan, maybe since the beginning (??). FWIW one of my favorites is Alex Kidd in Miracle World 'No One Can Do It Better'. So chill.
Anyway, I noticed we are using invision community software here! If the reason for removing signatures was due to bad/unwanted external links or images, then it is probably possible to write a plugin to check the content of a signature before it can be saved, and not allow it to be saved if it contains a URL to an image that is externally hosted (while still allowing external links to artists websites, etc)
e.g. via regex matching against the content of the signature text area before it is posted.
If I can find the time I'd love to try my own hand at writing said plugin, though if what I described sounds like what is needed, there are many much more qualified developers available for hire over here:
https://invisioncommunity.com/third-party/providers/
Just a suggestion!