MS Firewall - Mapping multiple ports?

I'm running Windows XP on a computer I'm using to "share" my cable connection, with the builting Internet Connection Sharing and Internet Connection Firewall.

I've got some applications (chat and games, mostly) that want a range of ports mapped through. When I was using my old Linksys router, this was no problem, I just put in the start and end of the port range. But with MS's stuff, I have to assign a label, IP address, internal, and external - for every port. This doesn't cut it when I have a hundred or so that I want to map.

My question is this: Is there text file or registry entry I can edit to let me access these mappings directly, or better yet, a tool that will add these for me?

Mainly the 2300 - 2400 range of ports for MS's Directplay, and I may want to change this from one internal IP to another occaisonally.

Any help would be appreciated!

There is this

Or the ms way

hope it helps