Enabling anti-flash means huge abuse of what is should do. If lets say for example me and zole on the same team, zole buys 2 flashes, he throws them in b while I run right at it, I don't get flashed but cts do, therefore I can easily shoot them, which isn't fair. Anti-flash plugin also takes away the realism of flash, because when a flashbang goes off, it blinds everyone, hence why it is used as a very tactical weapon against the enemy. You must have boundaries or it will breach it and huge amount of people will complain it. So even if I add it, I will be forced to remove it eventually. So it is a no, I hate flashers, but to avoid it, I usually watch my team, doesn't always work, but it is meant to happen, hence why your team can f up majorly.
On another note, I could add a team flasher punish instead of disabling the flash for everyone else.