I'd guess that given enough volume, longer barrels in an absolver would have the same effect as in a single shot: more velocity and a straighter trajectory. A shorter barrel might actually be beneficial, giving you a wider spread as the darts fishtail all over the place. I'd be interested to see what your results from actual tests show, I'm just theorizing here.
17/32nds brass might make for a better barrel material, as you'll be able to pack it more closely together with its thinner outer diameter. If you're just after 6 shots out of one shell and you don't mind messing with half darts, a three barrel absolver with each barrel double loaded might be an option to experiment with.
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