I notice there's nothing for Aboriginal type units for Australia.
I don't think there's much for later era's for SE Asian units: Vietnam, Philippines, etc...
Central Asia too, for any era. I suppose we can use Mongol/Hun/Turk units for that area for early era, but not much for late era.
I learned recently that Afghanis are the lost tribes of Israel! Would be cool to have lost tribe of Israel units for a new Afghani civ...a cool idea. Could be used for an Afghan civ, Hephthalite empire, and Khazar civ.