I completely agree with this idea. Simply because I too play glad, and have trouble seeing as it is. To shuffle through combat text in the chat window is very difficult. The shear act of it makes something like Pugilist an impossible task for me.
It also goes without saying, but this was in FF11. I trust that the development team may like the idea too, and just not have put it in yet. This is something that would benefit us a lot, so I think you should put it in, if its not something already in the works.