compositor backdrop always on top so nodes never obscure the backdrop.

When compositing you need to see the backdrop and the nodes. You also need to zoom in on the specific node you're about to tweak, this causes problems because as you zoom in, all the nodes get bigger and cover the backdrop, meaning you can't see what you're doing.

I think a good fix would be an always on top option for the backdrop, so nodes go behind it when zoomed in.

Alternaively for people with small monitors that don't have space outside of the backdrop to view nodes, all nodes other than the selected could dissapear when zoomed in beyond a certain (tweak friendly) zoom level.