ZDoom

Similar to my previous suggestion. I know that shaders can be used, but PBR doesn't allow shaders to be used, so if a texture pack contains PBR, shaders wouldn't work.
So I think Floor_Waggle should have a tagless variant.
(Sorry if this seems duplicate.)

Shaders would not be able to simulate Floor_Waggle - Floor_Waggle moves the floor plane up and down (on the Z axis), fragment shaders (like the ones in GZDoom) can move a texture around on the surface that it is on, but not extrude the texture from that plane.

Custom vertex shaders, if they were a thing, could do what you ask, though. But... I don't think that'd be easy to add.

Currently, Floor_Waggle depends on tags, which won't work with existing maps since you can't set a tag on a sector on-the-fly in ZScript AFAIK.