Converting Windows Store app from 8.0 to 8.1

I have an app I want to update to 8.1. I have done the upgrade in Visual Studio and everything works fine, but the only thing that bothers me is that the layout options has changed.

Is it possible to keep only the minimum width of 320 pixels and the full view? Now when the user makes the app take 50% of the screen it displays the full screen style. The problem is that my full screen view requires the full screen (and not 50%).

So I would like something like this

<Application>
   <VisualElements>
      <ApplicationView MinWidth=”width320” />
      <ApplicationView MinWidth=”above320” />
   </VisualElements>
</Application>

So I have my snapped view at 320 (same as 8.1). If the user increase the app's width above 320 px it takes the whole width.

Is this possible?