I would like to return an incoming change set, rolling it back in the team
stream, and pushing it back to the developer that delivered that change, so
that changes can be made, and redelivered (eventually).

As a workaround, the developer can make new changes and deliver a new change
set, but then it is impossible to see the net result of the two change sets.
I don't think there is any way to logically collapse the change sets into
one net change.

Another workaround is for me to:
- accept the change set
- Find the accepted changes in my jazz:workspace history
- Create a reversal change set
- Deliver the reversal
- Reopen the work item
The developer then:
- accepts my reversal change set
- finds the accepted reversal in his/her jazz:workspace history
- reverses the reversed changes
- associates the new change set with the work item
Then proceeds normally (as if the change set had been rolled back)