According to Cisco documentation:

• privilege level 1 = non-privileged (prompt is router>), the default level for logging in
• privilege level 15 = privileged (prompt is router#), the level after going into enable mode
• privilege level 0 = seldom used, but includes 5 commands: disable, enable, exit, help, and logout

Source: http://www.cisco.com/c/en/us/support/docs/security-vpn/remote-authentication-dial-user-service-radius/13860-PRIV.html

My question is:

Why is it that the Configure Terminal mode isn't assigned a 'Priviledged Level'?

The reason I ask is because when it comes to TACACS configuration, we have the option to add command accounting, but the common configuration is for privilege levels 0, 1 and 15.

What about for commands run in Configure Terminal mode?

Are they not logged at all? Surely they are the most important to be logged?