Hi Ryan
This might help
viewtopic.php?f=26&t=855&p=4683&hilit=custom+fields#p4683 Mike provided some sample code for adding tabs, I've since used the concept of adding tabs in quite a few screens for a specific customer mainly to support their very unique and strange pricing scenarios and the integration they want to have to their website, for this same customer I have to add a logo to debtor screen which is in a similar situation because they want to see it on screen rather than just stick it in documents, similar thing for inventory classifications as well.
With the current image control on the inventory screen my advice would be hide the current control and simply replicate the functionality on the new tab with a new control.