Like the title says, a configurable list of players where BlueMap would not render if either those players are online, or if it hits the player limit, and similarly, a list of people that only if that list of players are online then it renders until it hits the player count limit.
Not sure if I'm phrasing this correctly, but for my situation its the following: my game server is running on a raspberry pi 4b with 4gb of ram, since this is a single-board computer with limited CPU, I have it set up so that bluemap will only render if no one is online because if it renders with someone online then it (slightly) lags the server, however, I personally sometimes join the server and leave it in the background, and since its running locally lag doesnt affect me, so I prefer the bluemap to be rendering while I am online, but if I'm offline and another player joins, it would stop rendering.
This is a little hard to understand and explain, if you need a better explanation just ask and I will try and explain it better, if you think this is not "useful" then I dont mind since its a veeery specific use case!