In light of this question that was asked yesterday on the Mother Meta: Magic wand time - what does your community need? (More questions from the Community VP), is there anything we need?
Hierarchical tagging has already been suggested, and as you can see from my comment, I really like this idea since it would allow us to put software-recommendations, software-assistance, and software-input-file-request all under software, and td-dft under dft for example.
Migrations of questions across the network, could be significantly improved! The asker of this question doesn't seem to even be aware that their question got migrated: How to extract transition density cube from .fch file in Gaussian?