Does Pre New 52 Superman have the ability to use the Superflare?
And do you think if Superman had full control of the Superflare ability, he could use it to emit solar energy out of any part of his body like his eyes? So he'd be able to shoot it out of his hands, or his mouth.
Personally, I believe that the Current Rebirth Superman (Pre New 52, Post-Crisis, Whatever-You-Want-To-Name-Him) should be able to use this power. As Batman told New 52 Superman, his heat vision appears to be a "precursor" to the Super Flare. It's very similar to Danny Phantom's ghost sense being a precursor to his Ice Powers.
We have also seen Superman control his Heat Vision with incredible precision, getting super large or microscopic in effect.
Now if he is able to use Super Flare, that means he can emit it from his entire body. So if he can emit it from everywhere at once, it's not that farfetched to say he can emit it from select areas of his body like his hands, mouth, even feet.