...this conflicts with the built-in 192.168.2.x addressing scheme that OS X uses

Uses for what?

Is this a solution for a problem that does not exist? I've been using OS X since the beta, and my job is IP networking. I am unaware of OS X using a built in addressing scheme, in the 192.168 range or any other.

Please explain

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The internet sharing component (/usr/libexec/InternetSharing) is apparently hardcoded for a 192.168.2.x network:
it will add an alias 192.168.2.1 on the "internal" interface and will create a 192.168.2 entry in the netinfo /config/dhcp/subnets... There seems to be no way to change that. Unless, ofcourse, if you can disable Internet Sharing and manually (or via a script) launch bootpd (which will obey to the configuration in /config/dhcp), natd and place the divert rule in ipfw as this hint suggests...

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