Lieutenant, Engineering Corps
Not sure if this had been said on here before, or is a planned feature already, but there really needs to be options for Terrain in multiplayer battles.
It's really, really frustrating to not be able to place a building in multiplayer fights because of terrain restrictions (the number of times my friend and I have been trying to show eachother a design or fight eachother that is building/land based only to be unable to do so is astounding)
Perhaps in the creation menu for servers there could be options for terrain features (Islands, trees and bushes) as well as an option for a flat world (Imagine minecraft's superflat) so that any building can be placed without issue.
Alternatively you could have it so that each player could edit a certain number of tiles on their side to allow them to place things, or charge them as you do in singleplayer.
Along the same lines, perhaps options for weather? Since they do have an effect on gameplay, being able to choose if you want rain or fog or whatnot.