As far as the broker and journal windows being resizeable, I think that could be arranged. Personally, I think there big already and scrolling is just something that is going to be required.
I'll look into the broker button. I didn't put it into the initial release because it involves scripting, and as I've posted this is my first UI. So I'll have to examine some other work and see how this button works. I'd like to put it in, because it is a great feature.
I'll alter the hotkey window as well to give the option to remove the background and frame.
If you like the times on the maintained window, I would suggest using the window in the Penta UI. It is exactly what your looking for. Just download the Penta UI and copy and paste the maintained spells window into the Rivet UI folder.