Some things I would like to see in myth retold editor-
Live scenario editing akin to having multiple people edit a google doc
The ability to do trigger work while a friend works on map design would be incredible and help speed up the time it takes to make a map.
More Eye candy and embellishments
Streamlined and easier to understand trigger interface. New system to set same type of triggers for a multiple players. For example, if i am making a tower defense map and I have finished the triggers for player 1, have a single button that can recreate those triggers for player two without the time consuming task of making each trigger for all 6-12 ish players.
Vastly increased conditions and effects
Allow certain customizations that don’t require triggers.