Colin, <<we posted at the me time - great minds?>>
Nice question.
Firstly, many of the sand shots I watched on the coverage, seemed to be nice and firm and perhaps even compacted a little - reminiscent of the Sandbelt's lovely firm bases that are a pleasure to play from, and a fine excuse for the tour boys to increase their 'sandy' stats.
I think Pat makes a good point, in grounding a club behind the ball, temptation for golfers to improve that approach of the club head into the ball/sand may be too great for some - and it seems much of the basis of the rules is to remove temptation...
But, I certainly like the idea for a practice swing in the bunker, to not only assist in mental image of the shot, but also judge the nature of the sand, be that soft or hard, wet or dry, etc.
Unfortunately, I do not see how these two aspects can exist at the same time, without the Kiawah local rule.
Is it possible to say that practice strokes are allowed, but in taking the shot, you are not allowed to ground your club??
For my own personal game, I would improve my ratio success of 'up & downs' by at least 25%, maybe 50% ( this maybe because I play most of my golf on two heavily wind affected courses where it is impossible to keep the sand consistent throughout the hundreds of bunkers across the 36) if it were within the rules to make a practice swing in a hazard.
I not saying I want this, just that is my opinion, as requested !