I'll look into adding a new step for selecting something from the inventory in one of the next updates :)
Sorry for necroing such a dusty old thread, but I failed to remember if this has ever been implemented into ORK. Calling a menu during dialogue to select an item from inventory? The drag and drop option ended up not working for me well simply because the situation no longer calls for an NPC to be present. It's one of those text-only situations.