ok. here we go.
Off the top of my head :=
trivial : colony sizes from SE3
small-medium : ability to pick starting tech levels (as in SE3)
large-huge : fully 3d interactive tactical combat with options to save battle as movie file for use in a mini-TV series
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The Unofficial Space Empires 4 Mod Utility V2.26
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Download as a .ZIP -(HERE)-