I would have to say this probably wouldnt be possible, because if it was possible to programatically modify the trusted sites list without user intervention (or even with), it would inherit a huge security risk.
You can however modify this via a centrally managed group policy, which would set this setting on all of your domain workstations.. You could do this with the following group policy option..
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by: wct296Posted on 2007-09-19 at 00:48:47ID: 19918863
I do not think its an IIS setting - This type of security is browser based and set in the options of Internet Explorer. Having the Web server have the ability to change this would be a security risk.
That said, if it is internal users, you can roll the settings for this out through Active Directory Group Policies (if applicable).