Sending a text code for authentication would need to be something that the RADIUS server does. You’d need a RADIUS server that does this, or that can do push requests to an app installed on a smart phone (something like Duo, but there are others too).
With regards to RADIUS timers, there isn’t an option in the Dashboard to configure them for the VPN client. If you need to change them the you’ll probably need to reach out to support.