This probably isn't what you want to hear, but all of the
discussion of #4 (and I haven't even mentioned Volume and Ph
dependent rate parameters...) means that there has been very
little discussion of #6. I for one am still very unsure of the
pros/cons of the different options, and was hoping for a bit
more traffic on this issue. Perhaps it would be possible to push
back the #6 vote until after the #4 vote in the hope of getting
a bit more discussion on the issue...