Comments - octopuserectus

Sorry, I glanced over it, my bad. Thank you for the extra explanation and tips.
The patched game behaves really strange if I try to set it to 1366x768 via config (this resolution is not available for selection). The game would launch with ResX=470, ResY=752.
I tried to set the resolution via a bound key in-game to 1366x768, but that yields 1286x768 with letterboxing and pillarboxing.
Eventually, I made it fullscreen by choosing 1152x720 from the menu. %) Doesn't look in any way inferior to me.

Thank you for this.

Any idea why this might not work with 16:10?
I tried manual edits first (F3 8E E3 3F > CD CC CC 3F) and found your tool, however, I'm getting exactly same results with 16:10, 8:5, 1280x800.
When using this or manual edit for Steam Deck resolution, 1280x800, the main menu is inverted and displayed in lower half of the screen. Lowering the resolution fixes the rendering problem but defeats the purpose.