Does this still apply when you are using a proxi like Cloud Flare?
Yes, Cloud Flare does not filter anything unless you tell it do something. In Cloud Flare, you can challenge or apply captcha on specific countries, you can block ips.
I am not fan of disabling edit option in MAIN POST after certain time. You can always edit your post in stackoverflow, you just cann't edit comment/replay on comments after certain time frame.