I don't know why it is not remembering the option. It could be a bug. This preference page is really brand new and I bet that you are one of the first few people to actually use it. So if it was a bug in my implementation, I wouldn't be too surprised.
Could you be more precise on what you did? I just tried to set the option. Click 'Apply' button. Then close the prefs dialog. When I reopen it it is still set.
I also then closed my STS and reopened it (to verify if perhaps the settings where not actually persisted on disk between sessions). But that also seems to work for me.
But maybe there is some sequence of steps where the prefs are not properly saved. Or maybe this could be a Windows <-> Linux bug. Or perhaps you accidentally clicked 'Cancel' instead of 'Apply'.
Kris De Volder -- SpringSource