Yes I prefer the 16:10 aspect ratio as well. It's nice to have more room in the vertical. However 16:10 monitors are getting rare these days and 1080p is pretty much the standard now.
Turns out the text layout is controlled by menu_1024_768.ini as well so if I'm lucky all I need to do is edit this one file to get it done
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Finicky work though as I have to make one change and check it in the game to figure out what all the items are. I've already run into one that's supposed to be static text on the main menu page but I can't find it in the game... seems like some sort of hidden element maybe. Or maybe it's related to the sliding message text somehow.