Is it possible to have multiple backend user group access lists in Typo3? For instance, I would like to have an access list at the root level (which seems to be the normal case),

and another one further down in the page tree. The title in the backend would then look something like:
Edit Backend usergroup “Author” on folder level
Is this possible?
Access list are assigned to groups. So this is not possible with a stock TYPO3. However you might want to try the extension
be_acl.