Noob question about engine controls....

Why do some, mostly older, single engine, fixed prop, boats have two levers for the throttle?

here is an example

http://sfbay.craigslist.org/eby/boa/3405473191.html

Could it be that a two lever console was standard, that way you don't need to change the dash if you add another engine or "kicker"???

 

Left lever is forward, neutral, reverse. Right lever is throttle.

 

Its a simple system and in the past...all systems were simple !!!!!!

 

The mechanism under a single lever control is quite long and the cables come out perpendicular to the lever. That requires a deep console.
The dual lever control can be installed in a much shallower console and has the cable mounted at a 90 degrees angle. It is also less prone to wear and is more accurate, especially with long cables.

 

With twin engines single lever is the only way. unless your good at balancing a broom on your nose and swing a hoola hoop at the same time as you pat you head in a clockwise rotation.