Things i'd like to see.

Would like to have a toggle, certainly on the lowest difficulty setting to turn off certain elements, eg, raiders, rampaging beasties etc. (toggles in game so you can at least have some fun when you want it)

Gun turrets that actually have some use

opposed to blowing up your entire base when attacked. (Smaller explosions? The only use i have for them is to stuff a few together after a long corridor of doors, and then kill all the raiders when they blow them up)...
Failing that different types of turret, eg, standard (pretty useless) gun, flame thrower, tesla? (ie spread lightning damage to many foes, but require high charge of electricity), etc.
A power meter? least some way of knowing how much power you have available / drain. (is it sustained power?)
Traps. other than blasting charges, anything really that can promote fear for raiders. (probably doesn't need to be as elaborate as something from orcs must die, but still have some use)
Different stances / rolls for combat (stances probably wrong term) : setting options to prioritizing how aggressive people are at least, or toggles to set them to prioritize repairing over firing back etc?
On map overview would be nice to toggle view of roofs etc on / off, to tell if you can grow in areas that you have walls around? Or having the ability to cave in parts of the roof when in mountains?
Broader research options, If there's one to stop gun turrets from exploding i'll defiantly fire all my research towards getting that!
Killing combos for high level shooting or melee. you could slow the game down matrix style and have them bouncing around taking down several enemies in a row?

(j/k)