As you knew, I am not a fan of userscript, because I don't run any kind of business here, and simply would prefer to use given options/ features from forum. However, I have one suggestion for OP, that is: the userscript should allow users to set up their prefered timegaps between pumps, rather than a default (or only by now) with 24 hours per one bump (with delete of past bump, because it help users don't violate forum rules.).
This new option will help users to choose bumping their thread each three days or each 7 days.