Set Crystal Reports Grouping Level and Order at Run Time

Experts - I have a report in Crystal XI that has multiple grouping levels. I want to provide the users of the report the ability to select what (if any) grouping they want to see at run time.  For example:  I have the following groups currently in the report.

Group 1: Day of Week
Group 2: Field S
Group 3: Field W
Group 4: Field L
Group 5: Half Hour Interval
Group 6: App Name

I want to allow the users to specify which grouping orders they want to see when they run the report. So the first time the may select the grouping order:

App Name / Day of Week / Half Hour Interval

and the second time they may select:

Day of Week / Field W / App Name

I am thinking that it should be possible to set up parameters of like Param 1 through Param 6 for grouping order, and then if they only use Param 1 and Param 2 then they can set the rest to a default value of "None" and the rest of the grouping options would be disregarded.  Is this possible or am I having a pipe dream?