Add the Runabout to the C-Store (but leave it purchaseable at DS9 still). And add a Delta Flyer to the C-Store. And don't make it pathetically weak. It obviously isn't as strong as a starship, but make it decent enough that it's realistically somewhat playable at high levels. The Runabouts need some kind of retrofit or upgrade, too, they're simply so weak they're impractical for any useful purpose.