I got to say that i agree with both suggestions.
The first one beacuse I get confused with all the broadcasts for selling buying and trading and the fridays when PVP ladder resets, and if the broadcaster gives you the choices of whether if you want to Sell Buy ot Trade why not give the colors so people can know exactly what your intentions are?.
The second because im not the kind of people that looks at his chat room I just read whats in the screen and if it fades away It not a big deal for me, but sometimes there is people that get's like desperate to sell some stuff and just abuse the broadcaster or makes other peoples broadcast fade away wich normally makes the others re-broadcast.