I up graded from A01 to A12 and have not done the FST. As I understand the FST was to fix some other problems like disappearing cards, lockups and just about everyting else. I had some of those problems with A01 and doing the FST addressed those issues. Now with A12 I have not seen those problems and I have not done the FST. So from that I would say the FST is not required on A12.
The fake server trick will not stop the axim from syncing while it is in the cradle. But there are ways... The simpleist is to get a program called ActiveSync Toggle. It will allow you to enable and disable syncing with the push of a button on the desk top. You can get the program here
http://www.micrologics.co.uk/library/ast/
One Last Note. Without doing FST on A01 activesync would start itself and then cause problems. Without FST on A12 ActiveSync will still start itself but it causes no problems - that I have seen. Again FST not required.