At that distance bounced lighting or dynamic global illumination really isn't going to make that much of a difference. You'd be better off on focusing on making the large details seem "real" at that specific distance. IE making textures that look more like a view from an airplane or helicopter and less focusing on up close…
Tan... I really wish I could find a link definitively saying the Fox engine will have a indie/subscription/educational release. Have u found anything? Also... Major face-palm to all the noise second guessing yer GI aspirations. I remember the same scanline is more than enuff... No need for GI when it all can be faked…