Currently, the NFS share option is the only real solution. In our latest version we're still writing things to the file system itself. Eventually we need to definitely look at making a true load balanced option on the script side of things.
Normally, your database is where you'd see the most benefit from load balancing. Where you'd have a master/slave and all of the writes could be done on one and all of the reads on another. We'll be putting an option in to specify a master/slave probably in our next major release after 7.3 is out.
