A limited set of actions can assigned via macro commands. Incompatible actions are ommited from the generated macro. Also note that Macros are limited to 15 lines each.
KBM DRK
KBM WHM
KBM Sage
from bun boss video
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Reaper Cross Hotbar setup based from Bun Boss FFXIV on Youtube as of Sep 8, 2022 (except expanded XHB which I regularly access).
Personal Hotbar Setup