Focus Plus closing application when backgrounded

[Phillrb]

On the Focus Plus, is it possible to mark our application so that it isn't terminated when backgrounded, or so that it is given a longer grace period whilst in the background?

We would like to launch other native Android applications and then allow the user to return to our application in the same state that they left it.

If it gets terminated then the user experience is not great.

Also, is there an easy way for a user to go back to a recently used application?

Thanks