Not sure about the 147 but in the 156 Selespeed the steering wheel buttons don't work below 15km/h - could be the same with the 147?
The "feature" of the gearbox shifting to neutral after sitting still in 1st for a set period of time (not sure how long, but its in the manual) is darn annoying. Most of the light cycles in Wellington are short enough that the timeout isn't reached but there are a couple that will trigger the timeout. It usually hapens as the lights turn green, you hear the beep, beep, beep but its too late, you apply the throttle and all you get is a heap of revs. Quickly on the brake, into 1st and away. Must look strange to the car behind. I've now taken to shifting to neutral at the lights and moving to 1st when I judge the lights are just about ready to change to green.
But all those frustrating little "features" are soon forgotten once you hit the open road. This is where the Selespeed gearbox comes into its own.