I think this site could use a Vore/Cannibalism section.

Vore and guro is the perfect blend of aphrodisiac.

While Vore and Cannibalism are my preferred fantasies, I don't think that another partitioning of the boards is needed. Soft Vore pretty much falls into /f/ territory, and hard Vore and Cannibalism fit perfectly in /g/. If there was a separate board for Vore/Cannibalism, then every subgroup of Guro would want it's own board. That would be nice if you are looking for only a particular type of Guro, but I think most people come here to look at everything, and if it is spread out that gets more difficult. Also, posting would slow down in each individual thread, less content spread out over more area seems a likely result. Threads would probably stick around a lot longer too, which would perhaps bump up the bandwidth usage.

Usually, the reasons why boards need to be created is because one side of the users of an already existing board are constantly upset by content posted there by another side of the users or because too much content is posted on an existing board and therefore more categorization makes sense.

If there is no problem through annoyance or overflow, I don't think there is a reason to create another board.