the use flag "vscan" is used in the samba ebuilds. It is also described somewhat in the samba ChangeLog.
Created attachment 5921 [details] Updated use.desc Adds several more use flags and descriptions to use.desc
The moz* flags are supposed to be undocumented at the moment, at Azarah's request. Woodchip has changed the vscan flag to oav and added it to the use.desc :) thanks for the catch.