I thought that boardwalks were mostly s1, single speed.
but some time ago, a friend bought a d7.
for a reason I don't know, he decided to convert his bike to a 3speed internal hub.
(so it happens I got his freehub, sprockets and shifter, that I put into my d6 vitesse)
he has to keep his rear derailer to act as a tensioner.
to the threadstarter, I think it would be great if you have the singlespeed version, with the horizontal dropout, so chain tension would be no problem, while giving you the oportunity to use the coaster brake version as well.