A new tweak
is available in Cydia which allows you to change the way you open your app
switcher. ‘Lylac’ add tons of feature to your stock app switcher. The main
feature of this app is it combines both app switcher & Control Centre which
looks seamlessly beautiful. You can do the following action with this tweak:
Swipe your
homescreen card to kill all background apps
Swipe down
any card to access more actions
Customize
the app switcher the way you like


You can
configure it from the setting panel. This tweak is available in BigBoss repo
for $1.99

If your device has not yet jailbroken, then follow this step by step guide to How to jailbreak iOS 9.0.2 untethered by Pangu.