The neat thing about the rail is, it's a tad higher off the deck of the receiver, so a little easier to hold the shockwave overall. As you noticed this thing seems to shoot high, so a little rail height might help that aspect. Finally if you had a laser with a quick release and holds zero when removed/reinstalled, you could add/subtract it as needed, converting it from a sight aimed weapon to park the dot one.
If there's one thing I'm sure of, people will be dickering with setups for this thing for quite some time, simply because no one really knows how to use it yet, but everyone gets the sense it *is* useful. Given that i'm of the opinion it's one of the most interesting firearms to be made in awhile.