I am refactoring my ontology to be able to release it soon and have the whole terminology aligned of what people have contributed in the meantime.
When it comes to action types, it is much appreciated that you can copy an action type to make changes and take over the UX so that creating or editing objects looks and feels familiar.
We heavily make use of parameter defaults, constraints and overwrites so that the user is guided towards those permutations of the forms that we consider valid. Sometimes we make a change at one point and would like to do it also in the other action types which has to happen manually and is tedious since you have to manually copy the constraints e.g. filter conditions for the parameters etc. . Therefore, it would be great to simply copy a Parameter configuration to another action type. Even better: have Shared action parameters - similar to shared properties in the Ontology.
Also, It would be great if one could reference parameter values in the filter condition of constraints. If I pick a country, I would like only those to be available of a previously selected region. Yes, searcharounds and relations could achieve that result, but sometimes the conditions are more complex so that the current capabilities are not enough. The current workaround is to create a workshop module and do all the input fields manually. This somewhat breaks the user experienced and is much harder to maintain considering the similar action types mentioned above.