Regarding Dredmor: I don't understand why some people are against including it, you may like it or not, but it is a notable roguelike. It is a fault of the Actively Developing List maintainer that it was not included there, and this fault was fixed by adding an exception to the rules. Somebody add it to RogueBasin please, so that its enemies can rate it "@" on IRLDb.
Regarding categories: I think it's a nice idea. But probably we will know which categories make sense after the voting is finished. For example, an ASCII only category makes sense if the top three entries have graphical modes, single dev category makes sense only if the top three entries have multiple devs, and so on. Also unclear categories like "roguelike-like" might still have a clear winner.
New game category... I wonder what people mean when voting for an old game (e.g. DoomRL or DCSS). I think it means "the 2011 update is great", not "the game is great". One bad thing about the new game category is that it seems to discourage from the "releasy early" method (JADE could win if TB released it in, say, 2016, but since he released an early version this year, he cannot).
7DRL category... that's a very good category, but there is one potential problem (I don't know any example this year, but last year, Hydra Slayer was started as a 2DRL and then greatly extended, would it count as a 7DRL or not?) A bit similar for "portable games" (Hydra Slayer aims to be a good Android roguelike, but how do you tell whether people who vote for it agree with this or just like the desktop version?)