Right above the building/unit pop up on the campaign map is a graphical error with a line going above the window about an inch.

Could you make the campaign length seperate from the research and build/train length. I always seem to run out of time before researching enough or (in epic length) research takes forever. If you changed that, it would add a lot more customizable stuff.

The ability to configure the controls ingame would be usefull the most since they can be confusing sometimes.

Seasonal foliage would add a lot to the campaign map.