Please file a proper bug report/feature request at Panucci on bugs.maemo.org, so the developers can deal with this issue in a more organized manner and eventually implement the feature / fix the issue. This is true for other applications (and even built-in software) as well - report the problem in the bug tracker to let the developers know (and not forget until the bug is closed) that this issue still has to be dealt with.

The worst thing that can happen is that it is getting closed as "WONTFIX", but even then most developers provide a reasonable explanation.

A workaround would be to use a MP3 Merge Tool to convert the massive amount of audiobook pieces into a single-file audiobook.