Would LOVE to see a (toggle-able) series of upgrades that causes furniture items to be automatically upgraded to a particular freebie upgrade.
Such as: Master Carpenter - SDB, would make it so that, when you build an SDB, it's automatically one of the free upgrades (either have separate upgrade cards to allow switching, or allow a choice of which one), such as producing the Simply White SDB, rather than having to grind through menus for every single one. It would be a huge boon for those of us who have a lot of lag.
If this explanation is hard to understand, let me know; my migraine pill sometimes does weird things to my brain.