Pre-Session Hook in t3lib_userauth
Since TYPO3 4.5.4, session_start is called very early. This led to Problems with incomplete Objects in the session, like in #29274.
On the frontend, this could be easily circumvented by including or autoloading the classes via preprocessRequest-Hook. On the backend however, there seems to be no hook available, that is called early enough.
Therefore I think it would be useful to have a hook in t3lib_userauth, right before the session is started.
I'll try to submit a patch set on this shortly.