The UI in this game is pretty terrible, and I welcome every improvement to it, no matter how slight.
The ability to customize your chat log size and placement is a good start, but I would love it if we could also get the ability to add several chat logs, with different filters for each. That way, I could keep battle related info in one, and chat in another.
It would also be great if we could get an option to keep the macro bars visible without needing to keep alt/ctrl depressed, and also make the macro bars not appear on top of the status icons. Perhaps let us reconfigure the macro interface so that we could have one "default macro bar" that was accessible even without pressing alt or ctrl.
For example, keys 0-9 would activate the macros that currently are activated by alt+0-9, and we'd press ctrl to get to the second macro line. I don't know about you guys, but sometimes when I change up my macros, it takes a while before I learn the new layout by heart. It would be a lot better if I could make at least one of the two macro bars always visible, and be able to activate them directly with a single keystroke instead of having to use two.
Of course, because some people are really opposed to change, even for the better, there should probably an option to keep using the old setup.