Short ULR Service Script Modifications

Short ULR Service Script Modifications Yourls ([login to view URL]) is an open source shotr URL script It has a plugin architecture already [login to view URL] There are existing plugins that handle "some" of what I am looking for, specifically multi user, qr code, and piwik stats. [login to view URL] I need a yourls installation, that is true multi user system. Users will sign up for a paid subscription though paypal ipn technology and get access to their own links. A QR code will need to be be generated and displayed with every short url created. There will also be a Piwik install on the same domain Piwik is an open source web analytics tool [login to view URL] When an account is created on the short URL system, it will also be created in the Piwik system, which is already multi user capable. All URLs created with the short url system will be tracked by the piwik system and associated to that user. When a user is signed into the short url system, under the stats section their will be a link to "extended stats". The user will click on that and be taken (already logged in) to the piwik stats. Admin user will have visibility to the entire system, including users info and links. I need a TRUE admin panel. This will be a hosted solution, so working outside of the plugin architecture is allowed but breaking it is not.