Hi AReitter,
Welcome to the forum.
I've moved this into a seperate post as it's a slightly different issue.
If you are using NWC cache files then it is possible to refresh individual files if the others haven't changed. You just need to be aware of situations where we 'think' the file may have changed.
More details can be found on our blog here
http://beyonddesign.typepad.com/posts/2011/06/tango-and-cache.html
Lee Mullin
Construction Technical Specialist
Autodesk Ltd.