We have a mixed environment. The shares are used both in UNIX and Windows environments. Usually we are using Samba for that with simple username mappings.
I tried to configure DSS to support similar features. It works, but...
1. I'm not 100%, but it seems that uploading Group mappings resets User mappings
and other way around, uploading User mapping resets Group mappings.
2. After re-joning DSS to the ADS the group and user mappings were reset again.