I am looking to add/enable a Quest filter on the map. There is a global constant MAP_FILTER_QUESTS, which makes me hopeful the filter already exist and just needs to be enabled so it can be checked/unchecked.
If not, and I need to go about adding a new custom filter, how would I do that?
Also (off topic), I was also wondering how the modding community discovers the methods that can be called on ESO userdata. For example, in the Esohead markers addon, the author has this bit of code: