Facebook allows registration using a mobile number and confirms via SMS.
How can this be done with Jomwall?
BTW I can't test this because your demo gives 404 error when selection Register.

If I use AcySMS or use standard Joomla Fields to provide SMS registration confirmation, can JomWall login/Registration be configured to work with it?

SMS registration confirmation means taking the phone number a user specifies during registration, sending a code to it, entering the code to complete registration.

Assuming Jomwall cannot be configured for SMS Registration:

Can JomWall login/Registration be overridden and revert back to Joomla standard login/Registration?

If so I could then register with Joomla standard Registration (with SMS confirmation), and use JomWall login thereafter.