LARTC - Jan 2004 - NAT with ip rule and ip route

Hi, 

I am trying to achieve Stateless NAT with ip rule and ip route. Thanks to LARTC
doc, I have done it :)
But, I have a lot of client wanted access to Internet, setting up 2 rules for
each of them is not desirable.

For example I have 2 clients:

Current setting:

[root@son-ag webauth]# ip ru
0:      from all lookup local
32760:  from 192.168.8.113 lookup main map-to 192.168.250.113
32761:  from 192.168.8.112 lookup main map-to 192.168.250.112
32766:  from all lookup main
32767:  from all lookup 253

[root@son-ag webauth]# ip route show table local | grep nat
nat 192.168.250.113 via 192.168.8.113  scope host
nat 192.168.250.112 via 192.168.8.112  scope host

Can I do the following?

[root@son-ag webauth]# ip ru
0:      from all lookup local
32760:  from 192.168.8.113 lookup main map-to 192.168.250.111
32761:  from 192.168.8.112 lookup main map-to 192.168.250.111
32766:  from all lookup main
32767:  from all lookup 253

[root@son-ag webauth]# ip route show table local | grep nat
nat 192.168.250.111 via 192.168.8.113  scope host
nat 192.168.250.111 via 192.168.8.112  scope host


Or, is there a better way to achieve what I want? Please advice.

Thank you., 
Kaiwen