Is there any way to set a texture info to fb.blit?
I was looking at this thread here http://www.jpct.net/forum2/index.php/topic,4355.msg30380.html#msg30380
And thinking it would be great if i could also access a textureUnit1..3 as well as textureUnit0.
No, there isn't. If you need something like that, have a look at the Overlay class instead.