setting source ip on multiple aliases

[quel]

I am trying to find the appropriate way to set the external ip used.  I 
have a user who wants their outbound traffic to all go out their ip.  This 
way they have their reverse appropriate.

ifconfig snip:
        inet 69.13.34.82 netmask 0xfffffff0 broadcast 69.13.34.95
        inet 69.13.34.83 netmask 0xfffffff0 broadcast 69.13.34.95
        inet 69.13.34.94 netmask 0xfffffff0 broadcast 69.13.34.95
.82 is the base ip and .94 is the specific alias in question

route-to doesn't work because the gateway is the same for all the ips

Perhaps something like the following, except you can't specify user
nat on $ext_if inet from user aramith to any -> 69.13.34.94

I've searched google and the lists to no avail.  I presume there is a 
trivial way to accomplish this.

Thanks
-James