I found a way to play a custom game vs AI with the option of using cheats to have fun again.
- Open the editor.
- Open the map you want to play on. (They can be found in c:/Users/[name]/Documents/Warcraft III/Maps)
- In Scenario>Player Properties, set up the race and number of AI you want to face.
- You may need to also set custom forces to turn on Fixed Player Settings.
- In File>Preferences, under the test map tab, set the difficulty for the AI (unfortunately it is set for all AI, so no 2 easy 1 hard)
- Press Test Map (CTRL + F9).
You are now playing War3Reforged, offline, VS AI, with cheats enabled. Something you can’t do atm, in-game.