Default [Q] Facebook Messenger uses Phone Volume for notifications. Any way around it?

This is bad design. Notifications and Phone ringtone volume are separate. I am not sure why the android team would F up so badly. But now at nights when all other apps are silent, the Messenger goes off. I have to either enable and disable it every night or disable notifications totally. Is there a workaround?
Samsung S4 - VirginROM