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I think the bench might be nice. I have a 2005 Montauk 170, and the jump seats are never used except to board the boat from a dock., or idiling along. For me it would get in the way.
If used, it will put a lot of weight in the back of the boat, making planing more difficult.
If placed in the farthest aft posiition where the engine cowling hits it, there is one situation you might consider.
While running at speed, an impact, by the motor hitting an obstruction could slam the engine into he back of the seat. Damage or injury, who knows?
This is a situation which occurs frequenly for some and never for others. Your call!

There are reasons that option was discontinued. Usually they are economic, as it did not sell.

Good Luck!

(fixed abbreviated year per guideline #1 at the top of this page)