How can I make game window a bit larger? Changing resolution in the configurator doesn't seem to work.

If I recall correctly, the game had a set resolution in both MS-DOS and Windows 95 mode. The most you can do, if your graphics card supports it, is to stretch the resolution so it literally fills the 16:9 format for your screen. I've been able to do this on two computers, and it runs well in that mode. To do it, you'll need to go into the settings of your graphics card to do it.