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.)