I think I have a workaround.
- set your xhotbar
- copy your xhotbar to some class you don't care about, e.g.:
/crosshotbar copy BRD 1 ARM 5
- modify your xhotbar with desired PvP stuffs
- copy your xhotbar to another meaningless slot:
/crosshotbar copy BRD 1 ARM 6
- make a PvE setup macro that contains /crosshotbar copy ARM 5 BRD 1
- make a PvP setup macro that contains /crosshotbar copy ARM 6 BRD 1
This also works with /hotbar copy blahblah.
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