I was wondering if there is possibility of adding borderless window option to the game, as it seems really convenient for alt-tabbing to windows and back. Lately i started using this option in other games, as it removes the delay in swapping active windows/programs and while the delay is minimal in LFS, it should be no harm in having this implemented, no?

+1

I think that we could also exploit borderless window to do multi-screen support as well.

In file cfg.txt there is entry for window:

Window x y horizontalSize VerticalSize

With y=0 the window is so far upwards that the border is offscreen.
The left/right edges of window still can be dragged so you can easily resize it across multiple screens.
Or you can do it by cfg.txt:
x might be negative, I guess because depending which screen windows considers to be number 1 or something?
Something like this is borderless window across multi screens:
Window -1280 0 3840 1024

Ok, maybe not true borderless. But the window-topbar is invisible, no pixels are wasted, alt-tab works good without delay..