I use several 5:4 monitors on my home machine to get a good amount of workspace cheaply. However, OTC's maximum horizontal resolution seems to be capped to just one monitor, which creates one small problem and one significant one.

Minor quibble - menu text is a little small in this mode:

More significant issue, the market / black market / stock market panels to the left and right of the screen appear to be fixed width relative to screen height. While this obviously works fine on widescreen resolutions, it feels a touch cramped when the map only gets maybe a third of the screen?