Very nice. Would you mind setting the default through settingtypes.txt rather than just hardcoding it to false? Command console is OK for the coders, but something I'd prefer not to make the playtesters do.
Long-term, a craftable detector made with stuff available shortly after start (glass would be fine, no diamond, mese, maybe even no iron) that could be placed somewhere in inventory to enable display?
There is a basic hydrometer texture in the "crops" mod that might work for what Thorfinn is suggesting. https://github.com/minetest-mods/crops/ ... ometer.png
Nice! But the mod still shows incorrect biome values when biomeinfo mod is missing. I suggest to display a warning when using v6 but biomeinfo is missing.
edit: I now place a warning in the log file, to inform the server operator, when display_biome is used with a v6 mapgen without biomeinfo. The display just shows "temp = ?, humid = ?, unknown", to the player, rather than incorrect data.