Adding inherited permissions with chmod -E

I know it’s possible to add an “inherited” permission with chmod +ai, but I have a script that’s writing in entire ACL’s onto files so I need a way to add inherited permissions with chmod -E. I can’t seem to find the right syntax through trial and error, and I haven’t yet found a manual that explains this, but I *assume* that it’s possible.

Does anyone know? If I don’t get any answers soon I’ll probably end up reading the source if I can get my hands on it.

Example:

This works:
# chmod -E test
user:mkoreen:allow writesecurity

This does not:
# chmod -E test
user:mkoreen:inherited allow writesecurity
chmod: Unknown tag type ‘inherited’

P.S. My script is converting ext3 ACLs into HFS+ ACLs, moving from a linux file server to one running OSX and all the users have to still be able to read/write their files correctly after the move. The answer here would really be helpful.