No, XP Home does not have Power User settings. It does temp me to make the leap and upgrade this system to XP Pro. But it is a system for family/kid use and Home currently fits the bill.
As for setting it up to "Run As", I agree the implementation leaves a lot to be desired. I don't see the sense in doing this as it requires everyone to know the Admin password. Kinda defeats the purpose.
BTW, I have been able to get NFSIII to run ok for limited users. I installed it into a folder that had the file prives changed to allow all users to read/write. This worked for NFSIII but not for Porsche Unleashed. The latter seems to be wanting to read/write to some other files/folders somewhere else, but doesn't make it clear which ones.
Thanks.