I'd like to see multi-monitor support for the game, not just simple monitor bridging, but a seperate interface for each monitor that you can switch the mouse to through a hotkey. Basically several independent GUI's all working together. This would be extremely useful for cordinating attacks and managing seperate groups across the map.
You could probabally pull off multiple interfaces on one monitor, kind of like how linux has multiple desktops that you can use all independently of eachother on a single monitor as well but this would probabally cause a preformance hit because of having to render a whole new secton of the map all at once.
Alot of people would take advantage of this I bet, ive got like 3 monitors laying around that are just taking up space at the moment. It would be handy if the GUI was heavily customizeable with an external or internal tool, with components and windows you can turn on and off. Like the ability to resize the minimap, or dedicate it to one whole monitor for example.