Stopping Nickel to start another app

Hi, I am developing an application for the kobo that is intended to be launched from nickel via nickelmenu. However, as it runs, nickel draws over my app, and input seems to get taken by nickel even though my app is running. Is there a way to stop nickel to another app can run, and restart it when the app is closed, without loosing things like wifi access?

Thanks,
Nico