If I'm not mistaken this program has been around since the dawn of jailbreaking... IT'S CALLED ACTIVATOR!!!! Shut up already chpwn....
I do hear what you're saying but it does go beyond what Activator does in terms of app-switching. Could be a godsend for anyone with a dodgy home button, or someone who does a lot of copy/pasting between apps.
It doesn't do a lot, but even small tweaks have their place.