Hey Zerei,
Are you planning on doing all this testing on one machine? or are you looking for software to be loaded on many computers to test in groups?
I would have thought that using Dt in C2 would be sufficient for this (as it is supposed to be the same time regardless of computer speed right?). Maybe im missing something here.
Edit: just did a little research, seems like dt is affected by too many factors (if only slightly). Unless you intend to do a study on the accuracy of C2's or CC's timers first, I would use the flash timer to be honest.