Here are some modcomps that I would love to see incorporated into A New Dawn:
First up is
Capture Slaves, from our very own strategyonly. Right now, the Slavery civic is one to avoid. It carries nasty stability penalties and there's also the 'icky' factor I feel when I adopt it. But being able to capture enemy units as slaves? That would really set this civic apart and make it worthwhile.
Second is a feature I'm surprised isn't already in Civ4, since it was a standard setting in Civ3 -
Culturally Linked Starts. Bsically, this redistributes the starting positions so that (for example) all of the Asian civs start close to each other and far away from (for example) the European civs. I think that it would add a historical dimension to AND - I often despair when I see the Celts start next to Korea!
Those first 2 modcomps change game play, but I also think that the next 2 modcomps would be useful because they change the underlying modding structure. Here I'm only asking for these to be enabled behind the scenes - other modders (such as myself) can flesh them out into gameplay.
Civilization Specific Tech Trees - for a long time now (ever since Civ3, in fact), I have disliked Civ's 'one size fits all' approach to the tech tree. I would love for, say, Japan's tech tree to illustrate their divergence from European technologies. Whilst this can be partially done through unit choice, I think that civ-specific tech trees would take it to a whole new level.
Individual Era Unit Art Styles - currently, unit era art is limited to 3 divisions (Early, Middle and Late). This modcomp has SEVEN such era-specific unit art tags: Early, Classical, Middle, Renaissance, Industrial, Late and Future. This would really help to distinguish unit era art. Again, I'm not asking for gameplay implementation, just the functionality.