Question on self assessed tax setup

Thanks in advance for your help.

We have set up self-assessed(use tax) tax based on metalink note 948414.1

This note talks about setting up the supplier's party tax profile and mark his registration status as 'not registered' which is then used in tax rule.If supplier is 'not registered', system will automatically calculate self-assessed tax instead of sales tax.

The setup mentioned in the note will not work for us because we have locations in 20 states (and therefore we need the system to check whether the supplier is registered IN THAT PARTICULAR STATE in order to decide whether sales tax shoule be calculated or self-assessed tax should be calculated).