The 'option-r' key combination (alt-r under Windows) should enable record in the transport and should work unless there is a problem with your keyboard or you have a utility that captures keystrokes.
The track operations menu includes:
Archive/unArchiveFreeze/Unfreeze -- Freeze tracks to conserve CPU for softsynths or automation.
Group/Ungroup -- Group tracks to group-mute or group-solo tracks.
Thanks for letting me know, obviously the manual needs updating. If you need more info before that happens, please ask questions here.