Ok so in answer to all your questions am an XO in the Royal Australian Navy and our zodiacs (which also use jet drives) are high performance i knnow all about the less drag on the hulls and the fact that they are meant to travel forwards ours arent so good in reverse as well but the boats in game are a long way off but all our navy RHIBS (Zodiacs) are capable of doing a slam dive (e.g./ engaging the jet covers to slam the nose into the water and whilst doing that turning left or right which causes the stern of the boat to swing round, i know what im asking is probably into the thousands of lines that you'll need to do this but everything else handles as close to perfect as possible but the boats are just to glitchy to be used as an effective way of patrolling/delivery if you want you can talk to me on skype or something i can explain it better it is quite hard to do with text ;)
best regards
XO. J. Williams