An interesting idea would be to extend the already awesome 2-factor authentication and add support for FIDO U2F.
It’s more secure and even easier to use. As it is a cutting-edge technology, only a few major players have implemented it. But it could be a really good feature for Preside.
In a nutshell:
Buy a USB dongle, plug it in, press a button, be authenticated.
Works with NFC + a smartphone as well to authenticate on the mobile device (depends on the dongle)
Comparison to one-time passwords (OTP)
Good starting point for development (Java + js libs exist):