Ok, if you want uncommon commands, how about
:
/r_ft_override_face 1
/r_ft_face <font name>
Allows you to switch out all vector fonts during runtime without needing to dig into the XMLs. Bitmap fonts are unaffected. <font name> is the system's font name, not one you might have defined in the XML. Type the following to get back to the fonts defined in the XML:
/r_ft_override_face 0
You may also need to deactivate "Use small sans serif font" which sometimes gets set automatically by the option above.
Other useful font options:
/r_ft_contrast # - configure the smooth fonts amount. I think 0.5 is default.
/r_ft_hinting #
/r_ft_kerning #
/r_ft_brightness #
There are some more, you know how to find them. Some may crash your game.
Useful but you probably know it:
/cl_log_input 0/1 - turn input logging off
You likely also know
/r_performance # - parameters go from 0 to 7 with 0=Extreme Quality and 7=Custom
But probably not these:
/r_suggested_performance_CPU
/r_suggested_performance_GFX
/r_suggested_performance_RAM
/r_suggested_performance_overall
They are read only and you need to read their values via script (values have identical meaning as the parameters for r_performance above. The suggestions are bad though, I think with a 8800 GTX it suggested very high performance mode.