Dear Vaselina,
Your idea about customer-specific+material-specific licenses - as in foreign trade' sounds interesting. I am not familiar with that functionality. Is it SAP standard? If so do you have any links to articles or resources which describe how it works?
Any time I heard about such things in the past I was led to believe that it was totally custom.
Listing/exclusions has never worked very well for us and if it's lIke you say that it will not work anyway at ship to level - then more reasons to avoid.
Thanks.