It would be feasible to create a poll against the unofficial empeg registry, such that only one response per serial number is permitted (multiple submissions would overwrite previous ones.)
Both the serial number and original registration number must be entered, and they must match the same found in the registry to be accepted. (The registry does not display registration numbers on searches, to make this somewhat reasonable.)
An overall empeg rating could then be attached to each registry entry and displayed in search results. More specific data (like feature suggestions, issues, etc.) could also be collected and returned in aggregate form.
If anything like this sounds useful, by all means let me know and I can help set something up.
-v