Ok I'll admit I never really tried DOS1 editor, but one thing I'm curious about is import and export of assets. Was it a thing in DOS1?
If not, having a way to both import and export, say, a character and either all his animations or a specific set of animations would go a long way toward being able to customize said animations, add different body types, character models, etc... Or even make machinimas for potential cutscenes/trailers.
FBX would then be the most obvious format.

This is not strictly speaking an editor feature but more of a tool that could help people produce great things smile

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