Is there a way to just add a couple days to a layover when booking a flight?

When I look at travel it'll sometimes offer me a flight to a hub, a 10 hour layover, then the flight from the hub to my destination. At that point I might rather just spend a day or two in the hub city. Is there a way on most sites to say "ok, well then maybe just show me the 34 hour layover option or the 58 hour layover option" without buying the two legs separately and paying a lot more money?