I suggest freezetime to be 0.
Reason: In my early days I hated when I saw that everyone is killing me and there I am buying m4a1 using my mouse (LOL), after getting killed a lot of times, I started buying with keypad which later on improved my buying skill to be pretty fast.
Conclusion: Let it be 0, so amateur players can develop their skill. They will hate us (administrators for having 0 freezetime on server) but after awhile they will find out that we helped them by putting freezetime 0.
Cheers,
Popay