If you would like to have a simple app which can align more with your requirements, you can build one online in a few minutes, using iFreeTools Creator.
Check out: http://blogs.ifreetools.com/2010/03/building-simple-bug-trac...
The overview of the steps involved..
- Edit App Settings to re-brand, set time-zone, etc.,. (optional)
- Add Bug Entity
- Add Attributes for Bug
- Start using the Bug Tracker