Having any materia melded increases the spiritbond generation rate, so you can overmeld with junk if you just want to extract more frequently.

Some of the relevant phonology is described here: en.wikipedia.org/wiki/Standar...
One of the contexts is similar to a prolific process in Japanese: en.wikipedia.org/wiki/Elision...

Depends on what exactly you have in mind. For example, if you take a theory given in an uncountable language (e.g., a theory of the reals with names for every object), then you won't be able to Godel number the language. (This is why the cardinality of the language is a parameter in the LS theorem)