Resolved! 8.2 NAT to one IP?
I probably have done this before, but can't remember how. On 8.4 code, if I want to nat a server to be seen by only one external IP by a certian IP, but dynamic to all else, easy to do.10.10.0.4 > 10.100.100.3, translated to outside 192.168.100.4.10...