Add an inventory/collection list
Something filled out by the users to delineate their number of models owned, to stop someone from accidentally making an awesome list that they cannot field or to track painted miniatures
I like the sound of this as a Supporter feature. It will likely be a long time before I get around to it though!
Would also be nice if in addition to "owning" it there was a place to indicate "where". I have all my Warhammer 40k packing in BattleFoam boxes. and have about 15 of the cardboard boxes full. It is a nightmare to try to remember which box/tray a model is in.
Jon Kissinger commented
This is currently kinda an option - name a unit as a favorite and BS will remember it
Albert Freeman commented
Aurora Squad Builder (for X-Wing Miniatures) has this. Saves me a lot of grief.
Take entries from the catalogue that is models allowing you to specify number of models you own and how many is painted (it matters for some). Allow rosters to link to collection/inventory to give you feedback if you can field the list. And possibly give a list of models lacking for a shopping list.