Is it possible to disable the option to "Expand parent folder and all sub folders at once" when you double-click the expansion key (arrow / plus sign / whatever) next to the folder in the folder tree? or at least try to change the time/delay of the double click?
Quite often I open a folder in the tree and close it back quickly (cause I realize I opened the wrong one) but most of the time I end up opening all the subfolders instead 
Thanks!
We'll make this optional in 10.0.3.1.