Using unregistered transliteration modules
Fragment of a discussion from User talk:Rua
That sounds like a good idea. I assume you mean something like {{xlit|module_override=Module:ar-translit}}?
Well, the function I mentioned would also need such a parameter for it to work. But yes, {{xlit}} would also need to support that parameter.
Oh I see, there are more intermediate functions. I think for the transliterate function, "module_override" is a good parameter name, but for the {{xlit}} it should probably be shorter. Something like {{xlit|mod=Module:ar-translit}}, possibly even without the Module: part if we know with 100% certainty that all modules will be in the module namespace.