All the above samples should still work with App Connect 2. I posted a post in the docs for building App Connect extensions about thee changes in the API for App Connect 2.
The biggest thing is the deprecated dmx.requestUpdate() method. Other changes are in the API for custom components.
Also as a sidenote I want to point out that using dmx.global.set('transactionscroll', y); instead of dmx.app.set('transactionscroll', y); is prefered since the app instance is only available after the doc is parsed and global is directly available.