Reverse is highly overrated on a light boat. A set of oarlocks will save you a thousand dollars and get you back home when Sh-t Happens.
Put at least a third more HP in a surface drive than an outboard.
I built a 18 HP surface drive for my carp shooting/duck hunting/fishing boat. Great rig but should have gone 5 HP more as it won't match the performance of the 15 HP outboard that was on it. It does shine in shallow brush filled reservoirs, reverse doesn't work in the brush either.
A collapsible duck bill push pole should be mandatory in a shallow water boat also.
A well set up surface drive is a pleasure to operate, much like a tiller outboard, a long tail can be a chore.
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