Like for x reports in y time to mute players in chat like if you have them blocklisted with some message like: "this player was reported multiple times for toxicity in chat, so we hide his messages."
If you think this is worth pitching to Fizzer, you should create a Uservoice on http://warlight.uservoice.com/
and direct others who agree with you to upvote your proposal.
I personally think this is a bad idea since Warzone is small, Global Chat & forums are monitored most hours of the day (by the mod team), and this feature can be very easily abused.
In practice, toxic players are easy to avoid by just being selective about who you play against- e.g., being careful about joining Open Games, using your Block List, and getting most of your games from CLOTs & ladders & tournaments that draw from the competitive strategic community. I personally haven't encountered truly toxic players in a long
time this way.