Hayseed_MS
Spreader of "Endless Non Sequitur"
I know a little something about practicing, however I feel that something as critical as the safety device in question should not require practice in different situations. Know where the control is, it should not move and be easy to operate. You should be able to activate it at any time, without looking at it, even if you're in the middle of a turn such as in the parking lot situation described.
Makes sense. Personally, I am good with this as a safety device under these parameters.