Slightly related to the compose window size on a desktop/laptop: I don’t like the small screen size either, I use drag to increase the size already but the option I really would like is a something similar to Gmail.
In Gmail I can choose to have the compose window to “pop out” as a separate window within a window (sorry, not sure about the correct technological terminology). This would keep the Runbox 7 environment as is, and put the compose window in a separate box. This is hugely beneficial because when I respond to long emails I like to have both the original email open as well as the compose window. Currently I have to keep scrolling up and down which is really counter-productive. Sorry if I have explained this poorly, but hope this can be looked at.