mat_maxframelatency and a few other commands are included M0re's fpsconfig but not any of the chris ones.
I was speaking to some american cfg collector a while back who said he had passed the command onto cowmanglia or rhapsody, according to him/them after testing there was negligible fps difference. Leaving fps aside, M0re's cfg has always felt smoother to me than any of the versions of the chriscfg, I'd be interested to see if others have noticed the same and whether they can pin down the commands that make this difference.