Feat implementation in Solasta is absolutely something that can be fixed with money. Right now they rely on the 5e SRD, which does not contain all of the feats in the 5e players book. In fact, I think that it contains a very small number of feats. They are therefor forced to entirely home brew the feats.

With money to buy a full 5e license (or direct backing from Wizards) they could implement those feats very easily, and I am sure that they would do it compitently.