The Achievo project uses Bugzilla as a bugtracking- and feature request tool. Feel free to create an account if you encounter a bug and want to report it. You can also use this bug database to manage all your feature requests. So if you think of a nice feature, please create an account and add a 'feature request bug'!
Before reporting a bug or requesting a feature, first find out if it is not already added to the database by somebody else. You can use this searchform to search for bugs or feature requests. Make sure you search from all bug reports, also closed and deleted ones.
It may very well be that the bug has already been spotted.