Linksys WRT54GP2, no VPN passthrough?

I've got the above mentioned firewall/router/access point/VOIP interface.
Recently I have been trying to get the VPN passthrough working. After
getting things setup as I would think they should be (port forwarding and
such) I am not having success. I did some searching on the net and found
some people say the product is flawed and does NOT support VPN passthrough
even though it is advertised and even has configuration options for it.

Am I out of luck? Do you think that Linksys will refund or replace this box
with a better model if it should turn out they advertised something it
doesn't have?

Thanks,
--Dan