Would be nice if hitting tab would cycle through selections of units so I could quickly go through and see what my forces are doing at all times. Coupled with a ____ feature (where blank is the next suggestion), it would be very conducive to playing for me, as my system isn't terribly fast and frequently get reduced to about 10 fps or less when the nukes start flying (especially in bigger games), and it becomes very difficult to mouse around and select troops and give orders.
Above mentioned ____ is: Would be nice if, say, the "f" key "focused" in on the currently selected unit. (centered view on unit, zoom in a little bit) I'm used to this from 3d programs where hitting f will zoom and focus on my selection, very useful for getting around.
Also, one thing I find rather annoying is not being able to order multiple units at a time. Sure, you can move them at the same time, but if I want a group of carriers to launch some fighters or bombers somewhere, or even just aiming a group of battleships to attack a certain fighter, I have to go through and select each one and order it, which is painfully tedious. Especially when the target is across the map. Hitting a key should select the entire group (or better yet, shift-clicking so you can select more that aren't even in the same group) and giving orders should give orders for all selected. Very counterintuitive for a strategy game not to have something like this imo.
Just my opinions. Certainly a fun game, I just find certain tedious things not-fun. It's one kind of skill to be able to keep track of all forces and manage them strategically, its another to be able to click and order every single unit before you get nuked.
(Someone mentioned a way to make all subs surface at the same time with the shift key, I can't see to get this to work though)