Doelan is a free software project. Everybody is encouraged to contribute to Doelan. There are lots of ways in which you can help to continue Doelan:
There are several places to look for more information if you want to get involved in the development. The first step is to subscribe to the mailing list. You will soon see something that can be improved or added.
There is actualy no automatic bug tracking system available like Bugzilla for Doelan. So, to report a bug, you must send your report on the mailing-list.