well, i have been working on this IIS setup for some time. even in IIS 6.0 they dont have a way to do this. maybe their trying to limit general ftp to home users, but that wouldnt explain why they have forgot to include it in their servers.
ive been workin on this for a month or so doing reasearch, and reading forums. nobody seems to have resolved this problem. but i have found a 3rd party program that has all the flexibility of IIS. BulletproofFTP. its a nice little program you cna run in the backround of your server that does everything from multiple users to group policy to restrictions, may i go on. and this program allos you to do passive commands and port limitations right on teh setting pages. and even better, that IP adders problem we are all having, RESOLVED! this program does it for you. you jcan either enter you outside router ip and it send it there, OR you can enter your dyndns name and password and it will aoutupdate for you!. lots of little toys that are very easy to use. as much as i would like to use IIS, this program does what i need and i dont ever have to troubleshoot it!.
