thats like for flight sim when you fly a cessna. i hate only using the 1 throttle to control the engine. thats why i fly jets
I suppose you're talking about the default Cesna Skylane, which indeed has only one engine (there are lots of other Cesna models, some with several engines). The fact it has one engine doesn't mean you only use 1 throttle to control it, you should - if flying realistically - use 3 levers (throttle lever, fuel mixture lever, prop pitch lever) - that's why, by design, the saitek throttle quadrant is built with 3 of them.
But, about ship simulation, I still don't understand why you would tie the levers together, and loose all the benefits of having independant throttle levers ! That's not very useful for planes, but when manoeuvering a ship, you very often use the engines at different levels - one forward, one backard, for example...