It would be a big improvement for our mapusers in AIMS 2013 and future versions if you made it possible to change the textsize, fonting and bold/incline/underline of the Groups/Layers in the legend. Today it is hard to get a good overview of the legend if you have many layers in a map (se image below)
Maybe a defalut setting could be a bold text for the Groups and a smaller non-bold text for the Layers?
Which Flexible Layout template are you using (Aqua?) and what browser are you viewing with? I don't recall any template having a legend that bolds all of its items.