The pick multiple list in month view is ordered by ical file name and not by ical name. So if you have no X-WR-CALNAME property, the order in pick multiple list is alphabetically, but if you have set X-WR-CALNAME the order in the list seems to be casual.
I use X-WR-CALNAME and I would like so much to see the icals in alphabetical order!
Thank you very much!
Piviul