At least we have one easy thing that Ertxiem suggested: In
battle, we click on the next square to move to.
Since all battles use the same engine, and since we already move one square at a time with keyboard input, I expect that it's easy to add mouse input.
Well, I see no need for this topic to go on...since it can't be implemented in-game (without lots of trouble).
I guess it's ultimately up to Craig to say what's easy to implement and what isn't.