Character set of DVD filesystem

I have Nero Linux 4 running on 64bit Ubuntu Jaunty.
When I burn a CD/DVD/Blu Ray with Nero, the character set of the filesystem is always ISO 8859 but I want UTF.

I have already tried all versions of udf 1.00 - 2.01 but no change. My whole system runs with de_DE.UTF8 (checked with locale). Is it possible to change character encoding in Nero?

Who can help?