[CentOS] simple NFSv4 setup

I'm trying to setup a simple NFSv4 mount between two x86_64 hosts.  On the 
server, I have this in /etc/exports:

/export         $CLIENT(ro,fsid=0)
/export/qb3     $CLIENT(rw,nohide)

ON $CLIENT, I mount via:

mount -t nfs4 $SERVER:/qb3 /usr/local/sge62/qb3

However:

$ touch /usr/local/sge62/qb3/foo
touch: cannot touch `/usr/local/sge62/qb3/foo': Read-only file system

I'd really rather not export the pseudo-root read-write, so how do I get 
this working?  Any hints would be appreciated -- thanks.

-- 
Joshua Baker-LePain
QB3 Shared Cluster Sysadmin
UCSF