How to exit from an application which doesn’t exit on press back button?

I am using Maverick application for GPS navigation. In previous versions the back button caused to quit the application. (Which is also correct behavior according to question: What is the right way to close apps in Android? ) Currently I have **Maverick 1.94** Lite. When I press the back button, Maverick only hides to background. (The same as if I pressed home button). I don't see anywhere in menu an option to exit. I wish to avoid task killers, or switching of my phone in order to quit Maverick. How do I **exit** from Maverick? My phone is SK17i aka Sony Ericsson Xperia Mini pro.