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Downloaded it, I'll take a look at what can be done in the evening.
Added 9 hours and 43 minutes later
I regret to inform you that when I try to load the save, my heroes crash. I quickly reviewed the code and tested the quest execution, but I didn't find anything wrong. If anyone else encounters this problem, I might be able to figure out what's going on, but for now, I don't know. I hope this doesn't spoil the experience of the map too much.
If you still want to finish the game, this command should help:
@MainCheckAllQuestFinished()
After that, you need to open and close any dialogue ("special abilities," for example).