For anyone who wants to use one or several commands at the start of each match without having to re-type them in every time, here's how.

1. Go to your Black Ops 3 install folder and into the "players" folder

2. Inside the players folder, create a new text file name mod.cfg . Make sure ".cfg" is the actual extension for the file and not ".txt", so the full filename should be mod.cfg and nothing else.

3. Inside the text file, type any commands you want executed each match, with each command on its own line. Here is exactly what I put to increase the zombie and perk limit:

zm_limit 36
perk 100

4. Save the file

5. In Steam, right click on Black Ops 3, go to Properties, and in the General tab, go to Launch options

6. Enter the following command which tells the game to execute all the commands inside the mod.cfg file when your press the bound key. Mine is MOUSE3 for my mouse wheel click, but you can make it any key that is usable inside Black Ops 3.

+bind MOUSE3 exec mod.cfg

6.1. If you don't know whether a certain key is usable inside Black Ops 3, open the game, go to your key binds, and as long as the key shows up when you try to bind it to anything, it will work. That's how I figured out MOUSE3 is my mouse scroll wheel click, it might be different for you.

7. Launch Black Ops 3, load the mod, and load into whatever map you want.

8. ONCE YOU ARE LOADED IN (as in, you can see your pistol and the HUD), press whatever key bind you set and it will execute the commands inside mod.cfg, you should see the text showing the command was executed on the screen like normal.

9. You will need to do this at the start of every match, including if you use a command to manually restart the map, but it makes it just 1 button click instead of having to open the console and type every command

Enjoy!