The ads are laid out as you see on the
ClassiPress demo, so anything outside of this layout would require some customization on your part. Ultimately, yes it can be done, but it's not how the out-of-the-box theme displays ad listings.
Custom fields allow you to customize your ad posting form to suit your needs. If you're going back to the title of the ad though, they don't effect this. The title is whatever it is you enter in as the "Ad title".
There is an RSS feed, but using this data to populate another site would again take some customization.