they can always put a toggle
Toggle is best.
noToggleCommunity needs more toggles. The idea sounds great!
It apparently works on newer styles too. I just plugged that url into a new tab and brought up the list of my contacts and friends, showing who's online and who's not, and I'm using Fundamental, a newer style.You mean this?
Spoiler:
It already does exist, but only in specific styles (usually the older ones). I wouldn't mind if it was implemented in the newer ones for convenience purposes for those who want it.
edit: Unless you're talking about a Who's Online version for just your friends and contacts...