The common messagewindows containing dumps and/or log-output are usually too small and must be resized manually. A functionality to maximize these windows by double clicking on the titlebar or a max-button next to 'close' would be very handy.
in the R4 release there will be a toggle hotkey (F11 windows/kde/gnome and MacOS X meta shift M) handling to maximize and minimize back to the original(previous) size. a max-button next to close is not possible in modal dialogs and the native titlebar of the window-manager is not emitting any events we can listen for.