continued...
Once the Xhotbar/player cycling macros are complete and in place, you can replicate the same actions on each Xhotbar in the same slots, giving the player 7 skills (one side) or 15 skills (two side).

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This could be just as easily replicated at dev level (for parties of 2-8) by enabling default actions on the d-pad when the corresponding active Xhotbar slot is empty, the way circle/X/square (cancel/select/jump) do now.