My compliments for your wonderful application!
I have some ideas that are not in your roadmap yet:
1. It would be practical to have a reporting module in WebIssues, so that issues can be printed. A report that contains a list (table) with open issues would be useful, and a report that shows all fields of single issue would be nice. If a report can be printed, it will automatically be possible to create a report as PDF file. This can be useful as a status report to the customer/client.
2. It would be nice if the issues dialog contains an 'OK' and 'Cancel' button.
3. I have used PVCS Tracker I the past, and in that application only the owner of an issue can edit that issue (and admin). I liked that idea.
4. From a project management point of view, it would be nice to have the ability to see (and print) a trend plot of the number of open (and closed) issues.
I think your application has great potential, and I hope you appreciate my suggestions.