@iain
It is probably not to difficult to implement new sounds to relativity. (may be there will be some issues with overlapping soundregions between different subworlds . Not sure.)
Many of us, (among me) could do this task.
There only are some conditions.
1) Upgrade only with permission of the "owner" , does every contributor agree that this still is a community project? I saw that Tachzusamm agreed to that, so do i for my little part to it.
2) Who has the latest "blendfile" including textures, Its only possible to upgrade it , if you have entrance to the sources.
where can we find it?