As you start typing a parameter name, it would increase efficiency greatly if Inventor could autofill the parameter names in a manner similar to the way Excel does or the way Visual Studio autofills function names.
When you have loads of parameters, it can be difficult to find a parameter from the list of parameters in the pull-down menu in the 'edit dimension' dialog box. I think it would be more efficient if the the list pops up as soon as you type any letter and the list whittles down as you enter more characters.