Hmmmm, well the Dimensional Aperture nature of Cyclops' eyes has been around since the old OHOTMU but he has been shown requiring ambient cosmic energy like his brother in order to supply the power he requires to access that energy realm. Plus both brothers have proven able to absorb each others attacks and go without injury and even channel that into boosted attack power (as we saw when Cyclops blasted Mr. Sinister way back in the day and left him a skeleton for a while). To do that Cyclops must also absorb cosmic energy to some extent.
I don't think we've seen many instances of others with cosmic-derived powers blasting either to be certain if they could or couldn't absorb the attacks and rechannel them. In a sense though they're similar to Superman only keyed to cosmic energy rather than solar energy and far more limited benefits from the power that they absorb.
Afraid I haven't seen that issue of Civil War, I really only got the main title and when still buying Spider-man what was covered of the CW in those titles. I can though see that pushing his powers like that however his powers are derived would be very risky and taxing. I think he was shown doing an extra-powerful optic blast during WWH: X-men. Does that mean he's up to Unearthly rank now or has he developed a Power Stunt to let him increase the rank a CS (or even 2CS) at the risk of Endurance losses and possible death?
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