You should be able to achieve this by modifying the skin's xml. For example, I changed my PN screen to show a full list of tracks on the right and shrunk the PIP/Viz window to appear at the bottom left of the screen inside the navigation area - roughly the same size as the Playing Now PIP button which appears in the other screens when there's something playing. Here's the relevant code segment in case that helps with what you're trying to do:
<Layout Name="Playing Now" Location="Playing Now\***" >
<!-- Navigation area -->
<Item Name="NavigationBackground" Placement="Left" Size="[Button Width] + [Overscan Left] + 6" />
<Item Name="" Base="NavigationBackground" Placement="Left" Size="[Overscan Left]" />
<Item Name="" Base="NavigationBackground" Placement="Top" Size="[Overscan Top] + 145" />
<Item Name="" Base="NavigationBackground" Placement="Bottom" Size="[Overscan Bottom] " />
<Item Name="Search" Base="NavigationBackground" Condition="If(Search, 1, 0)" Placement="Inside" Size="8" />
<Item Name="Navigation" Base="NavigationBackground" Condition="If(Search, 0, 1)" Placement="Inside" Size="8" />
<Item Name="PIP" Base="NavigationBackground" Placement="bottom" Size="17%" Crop="1%"/>
<!-- View area -->
<Item Name="ViewBackground" Placement="All" />
<Item Name="" Base="ViewBackground" Placement="Top" Size="[Overscan Top] + 55" />
<Item Name="" Base="ViewBackground" Placement="Right" Size="[Overscan Right] + 10" />
<Item Name="" Base="ViewBackground" Placement="Bottom" Size="[Overscan Bottom] + 10" />
<Item Name="Titlebar" Base="ViewBackground" Placement="Top" Size="[Title Text Height] + 16" Crop="0" />
<Item Name="LocationPicture" Base="ViewBackground" Placement="Center" Size="80%" />
<Item Name="View" Base="ViewBackground" Placement="All" />
</Layout>