I have currently disabled forceloading on my server, because of my concerns about forceloading. It seems there is no easy way to spot a forceloaded claim on the server, having a command that lists all forceloaded claims or distinct color on the map would be nice, and a way to un-forceload a claimed chunk in admin-mode without unclaiming it.

Forceloaded claims are separated from normal claims on the map.
Why are you concerned? There's a forceloading limit, pretty small by default, and the claim owner has to be online by default too.