@laanwj IMHO the "Start Bitcoin on window system startup" option doesn't fit below "Window". I was thinking if it could fit in "Main", which it does, but I think the best thing would be to rename "Window" into "Client".
This is self-explaining, all options that are in there are Client-Options and not only options for the Client-Window (and that's how I understand the current wording). I propose to rename the whole WindowOptionsPage stuff into ClientOptionsPage, to make this a whole. I have no problem with creating a pull for this, but at first what do you think?