Can I just reiterate the wonder that is Xkeys Pro

It has 2 layers and you can set any button to be a layer toggle or a layer shift. I bind a convenient button to layer shift and effectively double the number of buttons I have.

I have WASD bound to 4 keys on the green layer and the equivalent direction arrows bound to the same keys on the red layer. This gives me instant main or all movement, even in the heat of battle ;)

I too had the problems with modified movement keys and so settled for this solution.

Rob how to keymaps work in this scenario? I presume that because they are not filtered by the DNP that they don't suffer this limitation.

I am guessing here guys but I assume that if:

P. shift-a -> turnLeft
S. shift-a -> turnLeft

then the shift-a down and up will be recieved regardless of the DNP settings
NB: I match it to shift as blizzard will treat a modified key as the base key providing no specific action exists for the key combination