Issue: 
Application current design prohibits me from setting the form's web XPage to a specific XPage since the web form still also needs to be a regular web HTML form elsewhere in the application's web interface. Need ability to do similar to a view Form Formula override for the documents based on their forms. The "At runtime, open selected document using:" field on the View tab looks like the best place. Hacking a URL is possible for each column but is clunky for updates. 
 
Solution: 
Assuming you haven't given the viewPanel a specific var name (e.g. rowData), it has the default variable name of viewEntry.  
So we can update the view panel's "open selected document using" field to: 
 
var curDoc = viewEntry.getDocument(); 
return 'x' + curDoc.getItemValueString('Form') + '.xsp'; 
  
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