I'll add one ...
Hot swapping for audio files on the arrange page. Ableton offers this and it rocks!
Hot-Swap For Audio Tracks
The Hot-Swap feature in Simpler, Sampler, Impulse and Drum Racks makes for very quick auditioning with MIDI work. But if you prefer to work with audio loops in Session View or sequence audio events in Arrangement View, there is a hidden way to use Hot-Swap. In Clip View, right- or [Ctrl]-click the audio file’s name (just below the top of the Sample box) and select Manage Sample File. Now the Replace Files browser will appear on the right and you can click the Hot-Swap button to the left of the filename to audition replacement audio.