I'd like to have a sensor showing my location relative to the map; for my purposes a "chunk offset" would be fine, but maybe other people would also like the exact position rather than the rounded chunk position.
My thought on display would be: "position = {X}, {Y}", eg, "position = 20, 30" or "position = -10, -10"
X and Y are the chunk offset from ... either the map zero, or my spawn point -- I'm genuinely not sure which is better, because I don't do multiplayer really, but either would work fine for me. I'd use only integers, no fractional chunk offset displayed.
I can add this using the remote interface, of course, but I wanted to suggest it because it feels (to me) like something other folks might also want to use.