sorry for the necro post, you probably already figured it out, but for people who are lookin through the forum first, before asking a question, i figured it wouln' hurt to point out, the 8 way movement allows for diagonal (which the default movement doesn't allow) if you want the isometric, try to find a way to disable up,down,left, right, and have those keys/buttons, do the different diagonal movements, just a little script editing, though, I'd have to see the one you're working with and even then, my scripting ability is... negligable, but for the wonderful people who can script, they usually put instructions/descriptions for each of their scripts, so you might be able to find how to modify it for the movement..... welll thats my two cents,
hope your game is coming along well.