Global texture option ( instead of specific texture) for brushes which references a global texture palette...with scale,strength,contrast,invert settings...for papers, canvas etc. ( kind of how gradients can ref colour 1,2 instead of specific col)
So that many different brushes can be used which have a common texture but which can be changed via single palette.
Change the global texture in the palette, and all brushes using that global texture adapt new texture.
Perhaps also a "global texture layer" which can provide the paper or canvas texture under the painting.
Global textures
Re: Global textures
will be available in the next release