Parameters should receive a better support. Currently there is no way of structuring them, sharing and reuse support is very basic. I suggest handling them like requirements, storing them in documents. That way they can be reused, shared, and traced to. They can also be structured in chapters and subchapters.
I also suggest having (at least) simple computations available for parameters, so I could define P3=P1+P2.
I created a workaround with a Parameter Domain, storing parameters in a document as nodes, and then create the Project/document Parameter field on request with a trigger. Downside here is data duplication and synchronization.