Yafray vs Blender question


I’m trying to use some of the excellent Angle Maps (and skymaps) posted on this forum, and while this seems to work pretty well with the Blender Render, for some reason Yafray does deform these and I can’t seem to find a way to size place them as they should be like with the internal Blener rederer. What do I do wrong ?

Also, is it possible to use other renderers in Blender like Brazil etc ?