This plugin by ManlyMarco lets you edit the configuration of other mods while ingame. The menu is bound by default to f1.
Released on ThunderStore for mod manager ease of access.
BepInEx.ConfigurationManager is licensed under GPL 3.0 and the license file is included in the download.
NOTE THAT THIS RELEASE IS UNOFFICIAL AND PROVIDED AS IS!
If you are a plugin developer and wish to develop against this, the official Github repository has a plethora of documentation. You are able to find Marco in the BepInEx discord server as well.