Custom/more art layers

[Northadox]

Rather than only having a fixed amount of art layers ala PR2, it would be nice if players could have as many as needed (or at least a good number more than what is available), both in front and behind the level's geometry. What would also be good is a fixed background layer that doesn't scroll. 
I believe PR3R has this feature.

[ThePizzaEater1000]

It'd also be a nice option to have a background layer that doesn't zoom either, so it's more consistent with the preset backgrounds. (PR3's 0 depth layers are great for backgrounds except for on this, so maybe a checkbox or something?)

[Master Raiden]

It would be nice to be able to draw on the background layer as well.

This isn't possible in PR2, so any art you draw will be moving in some way.