pineappledan
Deity
No it doesn't. There's SQL code to "hide" an improvement from the UI. CBP added a trait that allows the UA to bestow build actions on units of a specific civ. So just don't lock the special MarshPolder to the Netherlands (which would flag it for inclusion in the civ select screen), and give Dutch workers the ability to building MarshPolders via the UA.That's how it works in 4UC and the usage is pretty marginal. From experience it's just not nearly enough to make it even a decent UI. It also requires two Polder icons as a separate improvement, and I doubt Gazebo would want Netherlands workers to have two polder icons, one for non-fresh marsh, one for fresh.