3. Can flash supercookies/LSO's that normally remain stored forever making it possible to track and identify you and know all flash movies you've ever seen, be automatically deleted at the end of a session?
Two methods which I know work generally, although you'd have to test them to be certain in this case:
1) To lose them at shutdown: Opera versions and install methods vary as to where they place the cache files. You can discover their location with Opera>MenuBar>Help>AboutOpera, in order to make sure that files you don't want backed up are correctly listed in your /opt/.xfiletool.lst.
2) If you want to lose them during a session: Opera>MenuBar>Tools>DeletePrivateData is a tool for removing cookies, cache, etc. during a session, and it also makes possible the deletion of vulnerable email passwords before opening dodgy mail. You can configure what is to be deleted.
(Bug note: Opera versions before the most recent have to be closed and reopened for passwords to be effectively removed by this method. Bug is fixed in 11.01.)