Merchants: How can I get them to resell items they buy?

[Snappy]

I have searched for this info in the forums and have had no luck.. I havn't even seen anyone else post a similar thread. I'm wondering if it has anything to do with adding items to the item DB and setting them as not there until someone sells it to them.. I did notice the table in the db for 'merchants keep items' I set this to 1 but i wonder if this function is what I am looking for. (I'm wondering if this actually does anything .. prerhaps it makes em eat items that are handed to them.)
I am also wondring if maybe i just need to add a 'Merchant places items for resale' type key to the table.
Any ideas would be appreciated...