This is a pretty 'pie in the sky' request, but can you add some sort of Requirements Management features?
Users would be able to add requirements (separate from Issues, or maybe it's just a separate area w/in a project), and each requirement would have:
- ID
- Source (think parent case, except reqs can have multiple sources, and not all of them would be other requirements)
- Verification method (Test/Analysis/Inspection)
- Status
- Description
And then the requirement would have a verification workflow of some sort, performed by someone, and possibly witness/confirmed by someone else. Also some sort of workflow for requesting a deviation from a requirement.
Things to associate with each requirement:
- Issues related to the design/implementation/test/analysis/verification of meeting the requirement
- Links to/attachments of documentation detailing analysis done
- Links to/attachments of documentation detailing tests performed
EDIT: I realize I'm basically asking you to start competing with Rational DOORS and the like, but maybe you can do this for a lot less and appeal to smaller companies that need to compete with the big companies that can afford DOORS, etc?