[Scripting Question] How to edit custom metadata type from debug's metadata editor?

[Allan5829]

I want to be able to set/change map specific data so I added a custom Metadata type.
Changes made to the script Misc_Data

#===============================================================================
# Global and map metadata
#===============================================================================
MetadataHome             = 1
...
MetadataMapSize             = 19
MetadataEnvironment         = 20
MetadataDefaultTerrain      = 21 #My Change

module PokemonMetadata
  GlobalTypes = {
...
  }
  NonGlobalTypes = {
...
     "MapSize"          => [MetadataMapSize,             "us"],
     "Environment"      => [MetadataEnvironment,         "e", :PBEnvironment],
     "DefaultTerrain"   => [MetadataDefaultTerrain,      "e", :PBDefaultTerrain] #My Change
  }
end

I added a custom script PBDefaultTerrain which has the same format as PBEnvironment

begin
  module PBDefaultTerrain
    None        = 0
    ElectricT   = 1
    GrassyT     = 2
    MistyT      = 3
    PsychicT    = 4

    def self.maxValue; return 4; end
  end

rescue Exception
  if $!.is_a?(SystemExit) || "#{$!.class}"=="Reset"
    raise $!
  end
end

Calling the method pbGetMetadata($game_map.map_id,MetadataDefaultTerrain) returns an integer and I've testing that everything works as intended.

My question is what other script changes do I need to make to be able to edit my added metadata type using debug inside the information editor. The list of metadata that you can edit ends with Environment and follows the order of defined metadata. The only way I can define "DefaultTerrain" is manually typing it out in the metadata PBS which while doable, is very prone to misspelling and overall slower. (DefaultTerrain = ElectricT) I tried looking through the editor scripts but didn't find a clear solution. Maybe it has something to do with how I defined the metadata because there are strings that have an unclear purpose [MetadataMapSize, "us"] <- "us" in this example. I used "e" hoping to be able to edit in the same manner as PBEnvironment.

It's fine if this doesn't get resolved but it would be helpful for quality of life purposes.

If anyone's curious why I added a new metadata type called default terrain

Spoiler:

Inspired by Reborn and Rejunivation, I wanted to add custom terrains / field effects. I wasn't sure how to set up a default terrain in the same way those games do but upon looking through scripts I discovered a method

 battle.defaultTerrain

that sets up a permanent terrain in a similar way to R&R. All I did was find where that was called and add some conditions that change the default terrain based on metadata. R&R change the battle background depending on terrain but I'm adding animations to show that a terrain is in effect, similar to how weather displays. I wanted my terrains to not overtake the background but instead similar to how SWSH treats the terrain visual as an accessory.