I see you're taking the "request" in "feature request" very seriously.
FYI, changing the font size is on my internal wish list, so is customizing the toolbar buttons. Both are massive development efforts.
As for the toolbar icons, a ribbon toolbar is not going to happen. I understand that some people like it, but I don't. A method to make the icons in the toolbar bigger was added with v3.28, already a year ago, c.f.,
Depending on the screen resolution, the Windows DPI settings, and/or the individual strength of eyesight, the toolbar icons could be perceived as too small and as difficult to identify and distinguish. I’ve added support for scaling toolbar icons up to 200%. You can find the new configuration setting at File → Options → Appearance.