As I said, trapping Soul Gems from Summoned Creatures was already in the other TES games, so making a mod to allow this would just be RETURNING that
You sure 100% about that ? I seem to remember trying it (of course, anyone would at least try) and finding that it didn't work, in oblivion at least...
While I am not against such a mod, I would tune it so that summoned creatures at least only fill small gems. Or find a way to make it more rewarding to do it on non-conjured monsters (non-conjoured meaning non-conjured by yourself). This way you could still experiment in your cellar, but adventuring out and fighting would actually be more rewarding, actually giving you more recharge for the items you'll use on the terrain this time
