Hi there, thanks for your feedback -- I do actually get that question a lot :)
...unfortunately, the framework used to build the app does not support running in the background, so even though it's a feature people have asked for for years, I actually can't implement it short of rewriting the whole app to be native, which means I would have to rebuild the app for each platform. :(
Hopefully this changes somewhere down the line, because I know lots of people want that feature!