Quote - how would you or are you faking . blue sky color at a sunny day? in reality the blue color is only in the shadows . where the direct light hits(SUN) the colors are not blue from the sky.
in poser if i make an blue IBL then the whole render will have a blue tint. even where the sun hits the surface.

I do it with a (weak) IBL light for the bounce from the sky, and a (strong) yellow direct light for the actual sunlight and shadows. Looks like this:

(from L to R, IBL only, direct only and combined.)

Of course for more complex light interaction, like eg sunlight bouncing from the ground back onto the guy, you'd need GI.