Firespitter FSfuelswitch and FStextureswitch maximum configurations

[lookolookthefox]

Hello to anyone reading! I've got a big modpack installed that includes a bunch of USI stuff, specifically the USI Kontainers and the Cryo engines/tanks mods. USI Kontainer includes Fuel switching support for Liquid Hydrogen but not for the newer Liquid Methane. In the Kontainer's code, switching fuels is handled by FSfuelSwitch and FStextureSwitch2. In the former, fuels are declared with their costs, amounts and weights whereas the latter handles the actual switching. The fuel tank setups are numbered 0 to 9. I have been able to add Liquid Methane in by substituting for an unused resource, but I'd like a separate Liquid Methane + Oxidizer configuration. I can't however keep number the fuel tanks after 9 by going either to 10 or using the hexadecimal system. Is there any way to add more fuel configurations, or is 10 a maximum?