I like to put two things in my crontab: emerge -q --sync followed by glsa-check -ln affected. The problem is that glsa-check always outputs a legend even if there are no GLSAs listed. A -q option should suppress that output and result in no output unless a GLSA is listed.
Just drop stderr to /dev/null then.
Considering the other major tools offer quiet modes, I would expect glsa-check to offer one as well.
Doesn't change anything. I'm not going to waste time adding a IMHO useless option.
stderr is supposed to be used for errors, not for useless informations which belongs to a man page, IMHO.