Something like goggles that display the AOE of each torch as an MVP, plus the ability to see where the torches are at through the walls.

Makes hard to remove torches when we need mobs to spawn after tens of them were placed all over the base.

Would be also nice to use the tool to tinker every torch, like changing it's AOE from the max to something smaller for fine-tuning in case we need to allow natural spawn in certain places.

Thats something that I have on my todo list, but due to time constraints, I've only implemented a crude admin command, which dumps all torch positions to the admin console. I definitely want something that is actually helpful ingame and not just for admins but players as well.

I assume the crude admin command you are talking about is /torchmaster torchdump ? but that command doesn't seem to be working in 1.21 and without something like a frozen pearl there doesn't seem to be a way to clear ghost lights. Any thoughts on locating them in 1.21?

Your question doesnt really have anything to do with this issue, but are you experiencing issues with persisting lights after removing the lamp? I can add back some way to remove them - showing them might be possible, but do we need this? I've yet to encounter issues withe feral flare lantern, so if there are any, I'd like to know about them (preferably in its own issue)