Probl monitoring disk space on Solaris with vxfs fiel system

I am attempting to monitor disk space using an eval version of OpManager 5.5 on a Solaris 8 server which has the Veritas File System vxfs. I am using the "Telnet/SSH based monitors for Solaris". The problem is when opManager creates the command, it specifies the ufs file system (-F ufs). I would prefer to omit this competely so the df command ignores file system types and generates the report. I would also consider changing it to -F vxfs if this is the only way to do it. The complete command generated by OpManager is:

/usr/bin/df -F ufs -k

Is there a way to edit this command (is it an ascii query file?) somehow? OpManager is installed on a Windows 2003 server.

Any help is appreciated.

Thanks