Something that seems to be severely lacking in the RTS behavior is an option to set the max vertical speed to something other than the max speed. This becomes a problem when you have an isometric RTS game - like Age of Empires - where units are supposed to move half as fast along the Y axis as they do on the X axis due to the viewing angle. So perhaps you could have a property like "Y Speed", which could be a percentage value. Just a thought.
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Couldn't you do something like:
character is moving
character angle is 30 degrees
set max speed to max speed / 2
I think you'd probably get some sort of speed distortion(?) using that method. This feature should be included anyways considering how many RTS games are isometric.