I have two suggestions regarding the tags:
1.To avoid a even bigger chaos due to the community's suggestions, you should give us a list of tags we're allowed to add. I think that would make your life a little bit easier because you wouldn't have to sort trough our suggestions. Basically, provide us a pool of tags we're allowed to work with.
2.Is it possible to create secondary tags? It's almost like half of the tags are pairings and they should belong to their respective doujin. For instance, Mio_x_Ritsu would be a secondary tag of K-ON!-doujins. It wouldn't show up in the tag directory but only in the doujin page.
PS The mobile page is even more chaotic than before, but I'm able to zoom now.