CIMD tariff classes

Hi,

I know this has been discussed before, but has anybody taken the effort
to implement tariff classes for CIMD? If not, I need to do it. 

(I know this is a CIMD only thing, as almost all other SMSCs don't
support extra billing information. What would be the right way to
implement a thing like this? Maybe extending the msg structure, allowing
it to contain billing information that can be used by all SMSCs... ?)

Thanks,

--
Anders Lindh
FlyerOne Ltd