82681 Smart Search multiple listing

I would like to add the capability To Smartsearch for advertisers with preapproved accounts to add multiple entries under the same key word for advertising specific products. For example an advertiser who sells books may have 10 books on the same subject which should have the same keyword. Smartsearch won't let the same account have multiple listings with the same keyword. I don't want to lose this protection for all listings, just for accounts that have I have approved to have this capability. It would also be good to allow these accounts to upload 2 thumbnail size graphics that would be displayed with their listings for these accounts. Please provide the additional cost to add this feature.