I suppose the ideal form of this map would be to include everything that bercon already does, but handles bump and displacement better.
One thing that any texture option out there fails to do however is handle corners well, especially when using multiple textures. Need an option for wrapping corners, and ideally how to handle mortar joints like concave or struck, etc (but that might be asking too much without actually modeling it).
I recently started trying out ATiles for bricks and it seems like a viable option (especially since you can use custom objects), but I haven't put it to the test of a full facade yet.