The edit mode can be found under the game heading in the menu. You can use it to remove units, place units, change ownership and change IPC totals. Remember to disable the edit mode when finished making changes.
There are some limitations. The edit mode has trouble with land units being transported at sea. It can only place buildable units. It disallows illegal situations such as sea units on land, even though such situations can be useful at times.
Some good uses for the edit mode are:
- Take back an incorrectly executed move
- Setup a minor modification in a scenario
- Implement the Scorched Earth rule
- Help the AI out of a glitch
- Help the main program around a glitch