I'm not sure this will be possible, if only because programming varying levels of AI is not fun, but I'd like to see distinct difficulty settings for the campaign map and the RTS mode. Personally I'd want to set it to difficult strategy map, easy real time.
Of course if they are linked together I could shore up my weakness as an RTS player by getting into a good overall position, but it's individually frustrating to always get the worse of individual confrontations, and be overly tempted to autoresolve any important or close ones.