1. The old one. Increase volumes when choosing production.
This specially goes for deposits. When your high lvl, making another million of refill is just pure pain and agony. At least increase it tenfold. (25000 max instead of 2500)
(same with troop training in barracks, 10x the amount would be lovely there, and ease things up when training hundreds or even thousands of troops)
2. Option to add a second provision house.
Some of us use it a LOT. And, it's simply not enough. Many times I have to put out orders to other people, as I can't boost my PH any more. (lvl 5, and I loaded up with chocolate bunnies during easter, often using 2 a day)
Make it buyable with gems if you want, I don't mind paying some extra to have a second. I'd gladly pay 2-3k gems just to get 1 more.