Instead of dynamic parameters, we’re considering a more general-purpose solution - user input. The discussion is here: Possible feature discussion: User input
The Data Catalog may have additional item types besides datasets, files, and hyperlinks. Future versions may add new item types such as database queries. Currently, it’s just an idea. We would like to get started with something and then see how to develop it further. In any case, the Catalog is very promising in terms of possibilities for future development.