Taunton just did a review of lunchbox planers in the latest issue of Fine Home Building. One thing in the article that intrigued me was a quick way of increasing length of the infeed/outfeed tables--something I'd actually thought about but never tried. In short, it involved taking a 1/2" thick piece of MDF maybe 4' long (I'd probably use 3/4" phenolic ply) and cutting width-wise to fit inside the planer. Then, attaching cleats on either end that are adjustable and fixed to the table. You lose 1/2" of planer capacity, but gain a much longer in/outfeed table and theoretically may fix snipe problems. They also seemed to recommend the outfeed side being bowed up a little.
This all makes some sense to me, just wondering if anyone's actually tried it first hand...