Only redirect local drives not network drives

We have a new RDS 2012 R2 implementation and would like to know if there is a way to only redirect clients local drives and not their network drives. We have logon scripts to take care of the network drives and the redundancy causes confusion and performance issues. On the performance issue's if they chose the redirected network drive it takes 5 minutes or longer to view the contents of a directory versus instantaneously if they use the drive from the logon script. On our W2k003/Citrix implementation that seemed to be the default behavior and we would like that in RDS 2012 R2

Thanks.