Having the user parameters as a "Primary" window really limits is functionality. I want to be able to dock it into the interface and leave it up as I'm working with a model. This would allow users to quickly see the parameters they have and quickly change them (providing workarounds to a few of the requests listed below). Right now, I literally work with temporary screenshots of my parameters window (not kidding!) when I have too many to remember all of them.
It appears that, in general, users are requesting a lot of UI enhancements here:
https://forums.autodesk.com/t5/ideastation-request-a-feature-or/organise-parameter-window/idi-p/5693...
https://forums.autodesk.com/t5/ideastation-request-a-feature-or/change-parameter-units/idi-p/5812171
https://forums.autodesk.com/t5/ideastation-request-a-feature-or/autofill-parameter-names/idi-p/58188...
https://forums.autodesk.com/t5/ideastation-request-a-feature-or/user-parameters-show-quick-link-to-u...
https://forums.autodesk.com/t5/ideastation-request-a-feature-or/parameters-preview/idi-p/5841550