Keep Resolution at 2880x1400, and adjust the DPI (Control Panel > Display > Set custom text size). It gives you several percent options, but you can also type in a percent number you like. I'd start at 200%, then adjust up or down as you prefer.
Good tip! I'll try it. I saw that option and I adjusted it down to 150% when I was a 16,9 aspect ration. I'm surprised there isn't an option of 1440x900 option in Windows 7.