I would like to be able to see a prospective task I would be rendering before it starts. I personally may not want to contribute to some projects (for example something that has violence that I don't approve of). Could there be some sort of tool added to let be approve/deny tasks on such a basis, maybe from a description the author provides?

The scheduling matcher is on the todo-list but it is only on the idea level at this point. It would enable contributors to set their preferences towards work submitted by graphics artists pretty much like you describe (although it would be from a set of pre-set parameters like license, artist group, nudity, violence and the likes).
We usually do not get a lot of violence and nudity around here - I think there has been 4 or so sessions of the first 2000.

All right, thanks. I personally won't run BURP renders until this is added, but I'm probably in the minority in that regards. I'll keep watch for that.