Access All Terrain Brushes Universally

It'd be amazing for us to be able to use the different different terrain brushes across terrains they're not necessarily intended for.

E.g. a muddy battlefield with a crater in the middle with a bone-pile texture like in the skeletal plains, or a room with a fleshy textured floor, or an area corrupted by rot in a town could have a stark contrast with that red bloody looking floor.

Maybe like a toggle or a sub-menu for "unsupported" terrain brushes in certain environments, since I can tell there's some blending intricacies going on.