I've to admit that all this time I've been driving this almost blind in terms that I don't know current installation base usage statistics. This is crucial in software development because it grants the ability of know exactly what are the features more used and therefore, where this should be improved. Having said that, there will be anonymous usage surveys in future editions to avoid this subjective analysis because for me it takes lots of time to investigate each request, analyze possible pitfalls, caveats, etc. We don't need to be subjective if we can be purely objective.
In my opinion, you should run Chevereto only for registered users, disable guest uploads and enable hotlink only for your forum domain. That's all you need to care about. If some of your forum users don't signup for your service then they just don't use it. You are making a big deal about something that most of your users won't even complain and you are missing the fact that there aren't too many alternatives out there. You use Chevereto not because it has a mod or plugin, you use it because your images are hosted by you, not someone else so everything on top of that are extras that will get better with time.
There are several features in queue and due to the Photobucket stuff I did an exception and accepted this request. But please understand that there are other features waiting for months, even years. There are other persons using this software, I've to care about everybody.
P.S. People will always upload crap from time to time. Happens to everybody with an open system. You can't expect to have a system like this opened for everybody and full auto without looking at it from time to time. It needs at least your minimum moderation effort.