So I noticed that an Experimental Version was released stealthily, so I went and tested it. Cannot delete a dungeon though, so that sucks.

Also, I am looking to create a new mod for the guild quests, not just the quests themselves you see. I want to change the frequency when they are spawned, and more. Does anyone know which files should I be looking into?

The quild quest update time is found in src\core\variable.gd. The variable name is guild_quest_update_time. 

Inability to remove dungeons is related to the Forget button at the dungeon. Haven't had that happen for a while. In the past, I could still use the Forget button in the Travel panel when the dungeon was selected. However the Travel interface has been reworked so I don't know if it is still possible.  

Most of the day to day contact with Maverik takes place in the Discord channel.