I'd also like the feature to be able to specify screen resolution (Audrey is 640x480).
You can use any resolution you want. Generic Web Device controls actually an Orbiter (called Generic Proxy Orbiter), which has almost the same options like any other orbiter. You should see it on Orbiters page too, so you can change the resolution, skin, ui, etc.
<div width="100%" height="100%" onClick="alert('on Click event')">Click me</div>
Please let me know if it works so we can try something more complicated like capturing pointer coordonates and so on.