This hack is adapted from a similar one at ResExcellence to change your default font in iTunes.
You'll need a copy of Across Lite as well as a copy of ResEdit to do the actual hacking.
Before you start hacking away, please make a copy of your virgin Across Lite v2 application to compress and put it away on your hard disk in case you ever want to switch back to the non-hacked version.
Start up ResEdit and use it to open the Across Lite application's resources.

Double-click the "Txtr" resource to open it.

You can change any of the typefaces used in these defaults (although I don't think you can change type sizes). Let's work with the print font as our example. Double-click the "Print font" resource.

You can clearly see what the default font currently being used is. As you change it, its hexadecimal equivalent will change beside it. Highlight "Arial".

Type the exact name of the font you wish to use. Fonts that are wider than the current default will have spacing problems, so experiment with fonts that fit more characters per line. Feel free to experiment. I chose Tahoma. (If you're unsure of a font's name, type something in a basic word processor like TextEdit and highlight it to find out what the font is.)

You'll notice that the first two digits of the last line of hex (highlighted above) are unaffected by your typeface change: it's actually an error-checking length byte reflecting the number of characters (including spaces) used in your font name. It was "05" for "Arial", so we'll need to change it to "06" for "Tahoma". (You won't be able to actually highlight the number, but you can click the cursor to the right of it to backspace over it and replace it with the correct number.)

If you don't know your hex, just realize it's in base 16, where the letters A-F represent 10-15. So our decimal 10 is 0A (that's zero-A) in hex, 11=0B, 15=0F, 16=10, 17=11, etc.
That's it! Go ahead and change any of the other fonts if you want. I used Tahoma for my Print Font and Lucida Grande for everything else. Looks much nicer! If you want to save yourself some trouble, just download my hacked version here.
--joe cabrera