OAP, there are few (if any) alternatives for managing heat and heat dissipation in stealth aircraft. By design they are pretty tightly closed up. Heat exchanger inlets are difficult to design without compromising the stealth needs - as always, the design is a balance on weighted characteristics.
Engines is right though, the issues so widely publicised and spread regarding chilled fuel etc, were specific to test conditions. Yes there are fleet operating limits but are rarely approached. I'd mention Tornado engine ground operating time limits as a comparison here.