You know, I just assumed that was a 2.x feature not 2.1 specific. I know I didn't see it on 1.2.2 and 1.2.3 but I've been using 2.1 for a looong time now (was using the old 2.1 IPv6 Development version) so it all seems like a blur to me sometimes.
For CPU clock speed, I recall seeing two different measurements under CPU type on the dashboard, but it was in a VMware ESXi install so that may have had an impact on it. I doubt it was "live", it would probably refresh whenever you refreshed the screen and it may be a 2.1 specific feature but I remember seeing it at one point.