As requested, I explain you how to duplicate apps. Example with notes app: ssh to var/mobile/stash/Applications and copy and past renaming with what you want the MobileNotes.app. Open the new folder, open info.plist and modify CFBundleIdentifier, ad ex:
CFBundleIdentifier com.apple.mobilenotes2
Then respring. They are indipendent so they open in multitasking separately. Bye