Does anyone know if a windower4 plugin exists that replicates the ffxiv cross hotbar behavior? Or anything really that makes the controller experience better?
There is not a plugin for mapping a controller to a cross bar like that. There is a plugin to create an xiv-like hotbar, but in Windower4 you cannot bind controller buttons explicitly so it cannot support a controller.
xivhotbar github
Windower5 is right around the corner and I believe it will have this functionality so maybe someone will extend the xivhotbar plugin to support this mode.
This is what XIVHotbar can look like: