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This has already been addressed in the upcoming Tux Paint Config. Width and Height pulldowns are now separated, and go from 600-2560 for width, by 480-2048 for height.

Finally, any arbitrary screen resolution can be requested via "windowsize=WxH" option in Tux Paint's config file, or "--WxH" on the command line. (e.g., "tuxpaint --2560x1600")

This is documented in the OPTIONS documentation and in the man page. :)

Thanks, though!