This mod works with the Farewell to Arms update.

Adds a teleporter to every room that doesn't have one except:

• trap rooms
• the two special rooms for Arcane Gunpowder and Planar Lead

This uses the base game method of adding teleporters; it just never did it for every room. So safe yourself a bit of time by using them.

The mod Magic Smoke by NothingSpecial (fixed version by N0tAB0t) also had a command to do this manually for the current floor, but this mod does it automatically for every floor and has the exceptions mentions above to prevent exploiting.

Other quality of life mods I made:

• AutoReload
• AutoConsole
• Skip Intro And Main Menu
• Shrine Descriptions
• Blank And Active Item Reminder
• Mini Boss Health Bars

Installation
Get MTG:

• Download Mod the Gungeon at: http://modthegungeon.eu/#download
  
• Make sure Enter the Gungeon is closed
  
• Open ETGMod.Installer.exe and press "Step 3: Install ETGMod"
  
• Close dat thang
  

Installing mods:

• Go to your Enter the Gungeon Steam directory, usually located at:
  "C:\Program Files (x86)\Steam\steamapps\common\Enter the Gungeon\"
  
• If there is not one already, create a folder called "Mods"
  
• Drag TeleportersEverywhere.zip into the Mods folder
  
• If there is a "mods.txt" file in the Mods folder, delete it
  
• The directory should look like this: "Enter The Gungeon/Mods/TeleportersEverywhere.zip"
  

Then launch the game. If Mod the Gungeon installed correctly, you can press F1 to see the list of active mods.  Source Code: https://github.com/Goldenrevolver/Enter-The-Gungeon-Mods/ .