Parametric modeling is not a cool trick to have at hand, it's a way of life !
From a UX point of view the parameter window should not be modal, period.
The current "sort by time of creation" is strictly pointless.
And having the parameters table orderable (drag and drop), and sortable (column headers), and filterable (text field with autocomplete) ... would make life a lot easier.
And it would be nice to be able to "promote" parameters from sketck/dimesion/diameter (d1234) to UserParameter (by giving them a name)