I would vote no, keep it the same.
The whole point behind CS is planning and strategic playing.
By calling someone out via all chat might distract them and possibly tip-off their game.
By posting a hacker name via all chat might scared off that person so that -1 for the enemy team. (Even though GM won't be able to catch him right away, but with our dedicated team of GMs we will catch them eventually)
By insulting/trash-talk (remain within the rules/polices) is part of the game as well. It can do you good, or even backfired.
Also by keeping the /post via all chat might keep other players who are not participating in the event feel more connected with what is going on. They're like audience.
Just my opinion. Let me know what y'all think.