This is a fantastic light framework I have really enjoyed using however the main limitation I have found is the ability to bind commands to anything other than a button.

Is there any plan to extend the command binding to other controls (such as ListBox's etc)?

If you want to bind to events for other controls that wire up to commands in your viewmodel then you can easily accomplish with blend (ie triggers/behaviors)

<i:Interaction.Triggers> 

 <i:EventTrigger EventName="MouseLeftButtonDown"> 

  <i:InvokeCommandAction Command="{Binding MyCommand}" CommandParameter="{Binding}"/>

 </i:EventTrigger>

</i:Interaction.Triggers>