I also found this fix over at XDA tonight for the Ring Delay we are having while using the TF3D dialer. I know it says WM5 but according to other HTC users they've used it with 6.1 with the same results. The only downside is you have to use a .wav ringtone, so if your ring isn't .wav you have to convert it. Just follow the steps. Worked for me, first ring.
http://forum.xda-developers.com/showthread.php?t=258109