Tunnelling is one possible way of increasing the speed of light, but as far as I know it is not very reliable. It involves sending a photon through a barrier, like a mirror. Occasionally the photon will pass through and arrive at a target much faster than a photon which did not pass through a barrier.
photon1-------->(BARRIER)------->receptor (2 seconds)
photon2------------------------->receptor (4 seconds)
(I'm trying to remember this from an article I read in Scientific American a couple years ago, so if I got anything wrong, please let me know.)
As far as I can tell, this would not have any application to the problem at hand (old light, young universe). Who can say that God did not just make the light in transit (inserting light in space as if it had been there for millions of years) so as to give humans something to look at rather than a blank night sky? (or is that too much deus ex machina for you non-YECs?) I'm no expert, just speculating wildly.
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