Thanks for the report.

The Gobblegum machines are supposed to be disabled in every gamemode except Classic and Arcademode... so that must be broken on Gorod Krovi?? Have you tested the same thing on Shadows of Evil? I would have tested the DLC maps better myself but I don't own the DLC on PC and I have no intention of spending that much money on something I already own on Xbox lol.

Regarding the standard powerups showing up for certain actions, I can't really do anything about that because they are hardcoded events in map scripts that we aren't given access to by Treyarch. There might be some hacky way to prevent it but I haven't found a way yet.

I have tested the gamemodes on all maps and I have to inform you that you are able to purchase and use Gobblegums in GunGame on all maps, including Shadows of Evil, and in Sharpshooter only on Zetsubou no Shima.
I don't know if that is something in the game or if that is on my end (I am able to use Mega Gobblegums while playing maps, be it custom or original, can't remember if it has always been this way lol).

First of all, I am really enjoying the BO3 UGX-Mod and will be playing this for a long time! That being said, I have encountered some bugs/stuff that doesn't seem right:

• GunGame on Gorod Krovi is unplayable due to the fact that the first weapon is... well, i have no idea actually. It says XM-53 with 0 ammo, but it fires two to three green flame bursts and then the weapon in unusable. So you are unable to advance to the next weapon;
• Purchasing Gobblegums and using those re-rolls the attachments & camos of the current weapon you are holding;
  
• The standard powerups are still present and able to be pickup up when performing actions (linking teleporters in TG, calling the tram in DE, etc. ). Not really a bug, but still something to note;
• One last thing that I find funny is that the MR6 can and will have attachments after you slashed a web (Gobblegum machine in spawn for instance) on ZnS.

These are all that thing that I found using this awesome mod
Keep up the good work!