We had mixed results moving from ST8, but it appeared that if you just uninstall ST8 (Do not run any cleaners or the like to clean your registry, etc) then install ST10, most if not all the menu customisations come through. The usual ones however never come through. We usually wind up changing the colour, setting to ordered as default mode (one day we'll come into the current thinking, but not just yet :-)), turning off flashfit, etc, etc.
Some things you could possibly grab out of the registry and edit anything that refers to ST8 to ST10, but this may cause instablility.
I think the key thing is not to do too much between ST8 or 9 being uninstalled and ST10 being installed.