Interesting discussion.
I don't have this problem on my 9100, but it would be a nuisance, as the R09 does not lend itself to volume changes when settings levels at a gig in my circumstances. I quickly tweak the level using the 9100.
Chris - as I have no intention of opening my pre up, how much bigger would an Alps pot be, than what you have already fitted? Too big probably, but I'll ask anyway.