I would really like an option to have at least one custom group for recipes. I would personally use it to keep track of which ones I currently am working towards crafting. I imagine it would be possible to have multiple equip types in these groups; for example, you could set up a group that includes a whole armor set, or a whole weapon loadout.
+1, but why stop at recipes? how about doing it for inventory? sorting gear by damage type? sorting materials by what recs they are used in? good idea, probably suggested already