AKAfresh, dont know where you've seem them landing without reverse thrust, I use it all the time unless i'm landing on a long runway and ATC want us to vacate at the end. SOP is to use min reverse thrust on landing otherwise just relying on the brakes causes them to wear out quicker.
Most pilot's prefer to use autothrottle engaged as the aircraft has been designed for maximum use of the automatics - it also generates greater situational awareness. We can disengage the auto-throttle and the a/c can be flown like this - but we only tend to do it when the autothrottle is u/s - allthough some of the older 146 pilot's like to fly without the autothrottle.
The autothrottle is just like any other autothrottle when you get to 20ft rad alt it automatically retards to ground idle.
brgds
W.G