Secondary addresses and the Netscreen-100

I'm looking at options for providing additional address space for a
network behind a Netscreen-100 firewall. I've been told by the people
who maintain that particular firewall that the highest ScreenOS
available for the Netscreen-100 is 4.0.0r13 and therefore it's not
capable of supporting secondary addresses on the trusted interface. Is
this correct?

Thanks!