I just upgraded to IE 8 on our Terminal Server, but it asks everyone for search engine, turn on/off suggestions, etc.
Is there a way I can force one default setting for everyone through Group Policy?
You sure can. In your Group Policy Editor
You can aso then set whether the browser will display the your default home page, or the 'Welcome to IE' page.
Well I don't know about setting any particular default settings but you can disable the first run wizard by putting the following into a reg file and importing it to the terminal server:
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Internet Explorer\Main] "DisableFirstRunCustomize"=dword:00000001