Well, judging by the number of blow ups and, to be honest, no one really seems to know what's what here - this would be a good way to play and develop a motor. I know the Yam twin inside and out, I know every centimeter of the engines innards and I know exactly what is what and so on but being able to change the chambers represents an option of being able to use your bike in different applications or develop ideas. ie... I can't run my YPVS on pump fuel as it will die, with a cool head all I'd have to do is drain the coolant, pull the head and swap out the chambers. Refit the head (no gasket) and away I go.

People generally don't even know what makes a motor go pop when they run a race ignition with too much advance or the squeeze is way to high for the crap fuel going in so, yes... it's probably a very useful thing for you guys and will continue to be one as long as the bikes keep blowing themselves to bits
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These aren't the droids you're looking for.