The way it is spelled out in the VSS manual, you should have material zones for the synchronization to work.  You could create material zones to your dynamic hair using either the Grouping Tool in Poser or UVMapper.  I haven't much experience in this area so I couldn't guide you with 100% confidence.  But I am pretty sure you will need those material zones to implement the VSS Prop.  Maybe if BB is 'listening', he may chime in with further in-depth explanation.