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Ahh, I see what you mean. If you need special characters I think you will have tomake you're own font and load it.
From global.lua:
"SetFont: SetFont ( "myFont : 1) To change in game font. Fonts 1-3 are the default ones used.
NOTE: You can place your texture atlas bitmap font file in the Files\fontbank\ folder with the name FPSCR-Font-XX.png where XX is the unique name for your font. When you want to use it, simply call the command SetFont ( "XX", YY ) where XX is the unique name above and YY is the index you want to 'overwrite'. Remember to include the 'FPSCR-Font-XX-Subimages.fnt' file which describes the coordinates within the texture atlas image for the specific bitmap fonts contained therein."
I believe that works now.
Also you may find this interesting:
https://forum.game-guru.com/thread/219811#msg2602351
Been there, done that, got all the T-Shirts!