VPN

Hi everybody,
I currently have a m0n0wall to Cisco 3030 IPSec VPN that
joins two LAN IP addresses:
172.16.8.4   <->   170.173.42.84

I need to join another two IP addresses between
LANs behind the same gateways:
172.16.8.8   <->   10.193.232.36

In past situtations with other equipment I would just
create another VPN but in this case the operator of
the Cisco 3030 says his system will not allow more
than one VPN per gateway address! In his VPN configuration
he has the choice to enter either a subnet address range or
an arbitrary list of different LAN IP endpoints for the VPN.

Since the m0n0wall VPN configuration page allows only a single
range of IP addresses for the endpoint, from /32 on down, I'm wondering
if there is any way to manually add routes to a VPN to accomplish
what the Cisco 3030 is doing: routing multiple subnets through
a single VPN tunnel.

I found one posting, from bigforky, with a similar problem:
http://forum.m0n0.ch/index.php/topic,2471.0.html

but he was able to change the destination subnets so they
fit into a wider subnet that he then declared for the tunnel endpoint.
In my case the subnets are not adjacent and I can't change them.
Has anybody ever encountered a problem like this?

-RH