There are certain limitations to what a driver like vorpX can do. Altering the control scheme is one of these limitations in most cases, since this would require deeper changes in the game. Don’t let this ruin the fun you can have with vorpX, you get used to it quickly.
Regarding the zoomed in view vorpX offers several strategies how to deal with this: Auto optimizing game setting for some games, hints on startup for some games, a function called 3D-Geometry Enhancement in Geometry 3D games, various aspect ratio modes, and the option to zoom the entire image.
For almost any game you can find a solution. In many cases in a way that makes the game look as good as a native Rift app, in others you may have to live with black bars for example.
Please take a look at the “How to get the most out of vorpX” guide in the documentation. It explains this a bit more detailed.