Some of these may already be on here/have been stolen from other players, but they're all good ideas.
Repeat last building hotkey. So i can just hit a hotkey and the last building i placed will be ready again. It'd be far easier than the planned "last building" feature, which requires clicks and mouse movement.
*Stolen idea* Shut down building after buff wears off. Wouldn't it be awesome to have certan buildings automatically shut down after a buff wears off. As those with jobs/lives can't always be on to buff it again straight away.
Make provisions house/barracks able to produce more than they currently can! If i want to make 20,000 fish, i have to make 2,500 at a time. The same applies to building an army, i'm limited to 25 at a time.
Make market traded buffs last 50% longer if cast on yourself...maybe? Buff partners/guildmates aren't always on, and if you're in a rush you have to self buff, losing 3 hours potential from a basket. I'm not sure if this idea could be implimented or not, but i vote for it!