How to support roleclaims as audiences?

Hi,

We have claim authentication with a custom claimprovider for users and their roles.

We would like to be able to use those roleclaims as audiences.

I know there are 3 types of audience targetting:

* Global audiences (Ofcourse we could use custom properties and then sync to those and make compiler rules based on them, but is that really the way to go?)
* DistinguishedNames (We think this should be our option, but I see no possibility for customization, is that correct?)

* SharePoint groups

Any suggestions? (I know we can also implement a roleclaimprovider but we would like to be able to use audience targetting).

Thanks in advance!