What I'm trying to get across is that, like you said, it's convenient - and will be more convenient for people to use it negatively/abuse it, and encourage others to as well.
I'm not saying it isn't a nice feature, it would be great to be able to personalize posts like that, but it's too much of a giveaway to those who have no respect.
To help you, there is an addon for firefox called clippings - you could use that, and then put your specified bold/color into a script for that and it is just as easy as this suggestion would be.
