Granting Thor's request.
ProjektTHOR wrote:
I am sorry to necro the ♥♥♥♥ out of this topic, but I think this is a really good topic to have in the FAQ.  If someone would be kind enough to write up a well-formatted solution to this request, I will see that it gets pasted into the FAQ.
Ever had to test a gun but had enemies come and screw up your attempts?
Ever just wanted a sandbox?
Ya, sometimes playing without the AI may seem Necessary.
________________________________________________________________So heres how to do it:
First find the Skirmish Activities.ini file in the 
missions.rteIn here: c:/Program Files/Cortex Command/Missions.rte
After, copy Skirmish Activities.ini and paste it, rename it something else; such as Skirmish Activities_BackUp.ini
Then open the file in notepad.
You should see 
this:
Code:
AddActivity = GABaseDefense
   PresetName = Skirmish Defense
   SceneName = Grasslands
   TeamCount = 2
   PlayerCount = 1
   TeamOfPlayer1 = 0
   TeamOfPlayer2 = 1
   FundsOfTeam1 = 900000
   FundsOfTeam2 = 900000
   CPUTeam = 1
   Difficulty = 3
   SpawnIntervalEasiest = 20000
   SpawnIntervalHardest = 8000
   
//Ronin
   
   AddAttackerSpawn = ACDropShip
      CopyOf = Drop Ship MK1
      AddInventory = AHuman
         CopyOf = Ronin/Sandra
         AddInventory = HDFirearm
            CopyOf = Ronin/Bazooka
         AddInventory = HDFirearm
            CopyOf = Ronin/Glock
         AddInventory = HeldDevice
            CopyOf = Ronin/Riot Shield
         AddInventory = HDFirearm
            CopyOf = Ronin/Medium Digger
      AddInventory = AHuman
         CopyOf = Ronin/Gordon
         AddInventory = HDFirearm etc..........
Then delete everything under the spawn intervals.
Code:
AddActivity = GABaseDefense
   PresetName = Skirmish Defense
   SceneName = Grasslands
   TeamCount = 2
   PlayerCount = 1
   TeamOfPlayer1 = 0
   TeamOfPlayer2 = 1
   FundsOfTeam1 = 900000
   FundsOfTeam2 = 900000
   CPUTeam = 1
   Difficulty = 3
   SpawnIntervalEasiest = 20000
   SpawnIntervalHardest = 8000
*snip*
 Way:
Add /* to behind the first add AttackSpawn and the last line.
Like this:
Thanks for 411570N3 for reminding me.
________________________________________________________________Code:
AddActivity = GABaseDefense
   PresetName = Skirmish Defense
   SceneName = Grasslands
   TeamCount = 2
   PlayerCount = 1
   TeamOfPlayer1 = 0
   TeamOfPlayer2 = 1
   FundsOfTeam1 = 900000
   FundsOfTeam2 = 900000
   CPUTeam = 1
   Difficulty = 3
   SpawnIntervalEasiest = 20000
   SpawnIntervalHardest = 8000
   
//Ronin
   
/*   AddAttackerSpawn = ACDropShip
      CopyOf = Drop Ship MK1
      AddInventory = AHuman
         CopyOf = Ronin/Sandra
         AddInventory = HDFirearm
            CopyOf = Ronin/Bazooka
         AddInventory = HDFirearm
            CopyOf = Ronin/Glock
         AddInventory = HeldDevice
            CopyOf = Ronin/Riot Shield
         AddInventory = HDFirearm
            CopyOf = Ronin/Medium Digger
      AddInventory = AHuman
         CopyOf = Ronin/Gordon
         AddInventory = HDFirearm etc.......... etc...
 /*               [last line]
You know the recently created mod manager and Activities manager? Well after opening the interface, you can go on to just delete all the spawns.
Steps:
1. Open Cortex Command Mod Manager
2. Click the Skirmish Waves tab
3. Right click a spawn to bring out the "Panel" menu.
4. Push delete
5. repeat process.
________________________________________________________________Alternative Way 3________________________________________________________________MaximDude wrote:
The fastest and easiest way to do this is with 
SneakyMax's CC Mod Manager.
To disable enemy spawn open the manager, hit 'File', then check the 'Enable Enhanced Skirmish' box, hit 'OK' and close the manager.
To enable enemy spawn back, just uncheck the box.
Thnks to MaximDude for faster way to do Alternative way 2.
________________________________________________________________Well, if you don't like killing your 
own soldiers you can also do this:
________________________________________________________________Code:
AddActivity = GABaseDefense
   PresetName = Skirmish Defense
   SceneName = Grasslands
   TeamCount = 2
   PlayerCount = 1
   TeamOfPlayer1 = 0
   TeamOfPlayer2 = 1
   FundsOfTeam1 = 900000
   FundsOfTeam2 = 900000
   CPUTeam = 1
   Difficulty = 3
   SpawnIntervalEasiest = 20000
   SpawnIntervalHardest = 8000
   
//Ronin
   
   AddAttackerSpawn = ACDropShip
      CopyOf = Drop Ship MK1
      AddInventory = AHuman
         CopyOf = Ronin/Sandra
yeah this basically makes Drop Ships with unarmed Sandras in it, feel free to change it to anything else.
TROUBLESHOOTING- Make sure you didn't delete 
ANYTHING over the Spawn Intervals.
- Make sure in the index.ini that its not commented out, in case the error is from a mod's Activities.ini
- Make sure if your using windows Vista, to have your Copy of Cortex Command installed onto the desktop. Files cannot be edited in the program files.
- If nothing works, delete the file and rename the backup in Skirmish Activities.ini
- When using the Mod Manager/ Activities manager, it will comment out Skirmish Activities.ini and Mission Activities.ini, A good idea is to remove the // in front of it.
- If worst comes to worst, Back up your mods and reinstall Cortex Command.
- IF NONE OF THESE WORK, 
THEN, AND ONLY 
THEN, MAKE A THREAD ABOUT IT [or post in this thread], otherwise ill rage about it.
Thanks for contributions:
-411570N3, alternative way.