Strange, the schedule boot-time scan has been accessed through the Menu (or right click in SUI skin) of the Simple User Interface (or Enhanced user Interface I assume) see image.

So I too am interested where the tools is that you mention, as far as I’m aware it has never been in the ‘program’ settings menu. It isn’t something that you use frequently so it would I guess be easy to forget.

Personally I feel it should also available from the avast system tray icon.