i'm running FreeBSD and now have to cope with a timed scan and I saw that there are options on Linux systems to use inotify to tell the app that files are changing.
Fortunately BSD has a similar system, kqueue, wich unfortunately seems to have a complete different structure and syntax. Someone apparently created an abstraction layer to solve this problem called pnotify ( http://code.google.com/p/pnotify/ )

Is there any work underway to patch mediatomb to support pnotify ? Or maybe kqueue ? I could try to hack away at the source of mediatomb but I'm no programmer at all (I can try to read and understand whats going on tho), if nobody is gonna work on it someone might be able to point me in the right direction (wich files to change etc.) ?