Hi there
In addition to what 'scook' says, you can also set up your own custom keyboard shortcuts to address this (and other commands).
For example, to do what you are trying to achieve, I have assigned the "Y" key assigned to toggle 'Rewind To Now Time Marker' on and off; I also use the Spacebar (in its default mode) to 'Start' and 'Stop (and Rewind)' the transport, and I've assigned the "0" (number) key to 'Pause' (and then restart) the transport.
Check out the default key-bindings, and set up your own in:
- Edit > Preferences > Customisation > Keyboard Shortcuts