Allowing User Created Tabs in Work Items

I recently create a meeting type work item for meeting minutes, status, etc. Unfortunately, I'm having difficulty making it sufficiently generic for all users. It would be very helpful if users could create new tabs as required for their specific instance of the work item. There would need to be some involvement in terms of the layout of the tab, but just having a text/html field would be more than sufficient.
This could also be useful for other types of work items such as defects/features.

Regards,
Mark