all I can say is that I get quite a bit of users whining every time the time changes ^^
some because it doesn't change automatically, others because they find the lack of this knit in the time quite a bother
but I admit that there seems to be nothing like an easy solution to this problem
but what'd be nice would be a checkbox next to the boards "enable dst" switch which would change the dst of every user and not just the board
the international boards just wouldn't click it and the ones which work in a common dst zone wouldn't need querry it themselves
perhaps that sounds like a good idea?