Yodeck has limited support for interactivity. Right now, you can build and upload HTML5 apps as Widgets, but they must not be placed as overlays in order for them to be interactive. Same goes for Web Pages.
An on-screen keyboard would be a nice addition. Given that this would require a touch screen, we would also have to implement an easy way to setup and calibrate touchscreens (can be done).
We are marking this feature as Accepted and we will see down the road how things progress.