Shift-click items from profession pane, AH, etc. and add to groups.
Right now adding items you don't currently possess requires either importing itemIDs. This is fine when you want to get someone else's set-up or get an entire profession's worth of stuff, but if you just want to add a certain ore to a shopping list it's an absolute PITA to tab out, go to wowhead, look up the item, paste that into group maker, import that, then re-organize the newly created group into whatever subgroup you wanted that thing in.
In the past you could be in the group settings, there was an import option, and you could shift-click any item link and add the item to the group that way. PLEASE bring this back.