I use the green arrows to switch off writing to general relays. I only toggle the down arrow to read from a few big general relays.

I have the out, in, dm, private and local setup. I don't know why I Need to write to my inbox though. So that would be nice to toggle off writing there. 

I would like to be able to toggle off writing to search relay ( although I don't know if I am writing there to get info or if I am reading).

I also find that removing reading from general relays altogether doesn't seem to impact seeing notes whichay mean amethyst is pulling my follow list using outbox model to read from wherever my follows write too. But maybe it is juts my follows are all primarily in the OG WoT.