By the way, there's no issue on Gitea for this yet as far as I'm aware. Would you mind opening one?

We already have two types of sligners.  Regular stone and lead bullets.  And Baleric and Rhodian have their own boost based off those parent tempaltes.

For slingers you could for sure give the elite ones with lead/clay bullets more damage and range than militia or tribal units with stone projectiles (EB2 does this).   Any more skilled unit would also probably fire a bit faster. Does this game have accuracy mechanic? i think some of the Scythians in the DE mod dodged projectiles at least.

This is what we did with heltos: Helots have 25% less range, wider spread, and 10% less damage than normal citizen infantry, but the same gather rates as civilians. They have 75 HP and cost only 40 food and 10 wood or stone. They do not receive forge techs. But yes it doesn't make as much since for other Greek citizens fighters since they were still free citizens.  Maybe their ranged units should just take a little longer to promote than other ranged units.  And then when you combine that with hoplite tradition, you realize their infantry, hoplites in particular are a little move "valued" in their eyes.

Ah ok that makes sense. Yes when using mixin it does get a little overwhelming with all the different info in there.