It is because you have to have a special character type of fearless for a wheelman and maniac for a button man and if you are trying to put the wrong character type in it will say it is unavailable.
Not entirely sure, but I think the wheel man drives the mafia car.
Press a button with an icon of a steering wheel with heat waves rising from it. Google "jeep heated steering wheel button" for a photo of same.
The middle mouse button is usually the scroll wheel. Push the wheel down to click it.
Standard mice today have 3 buttons and a scroll wheel. Left button is SELECT. Right button is MENU. Center button is NAVIGATE. Scroll wheel scrolls documents up and down.
You shove the button in the center of the steering wheel.
roulette wheel is a part of the casino collection in the New York collections and are only found exclusively from the daily chance lottery.
All Lotto Items are Daily Chance Drops~
Press both mouse buttons at the same time.
There will be either a button on the steering wheel or in the middle of the steering wheel.
Gaming
to the right of the steering wheel last button
Just use the srcoll wheel as a button, press it and the tab with the link will open. Works great with Microsoft Office products. http://hubpages.com/hub/3-button-vs-wheel-mouse