Is there a way to make a library file that automatically has the functions/procedures loaded on startup and after it any new or open ".mw" can use functions/procedures from library with no redefinition?

Can I make something like it using codegen (dinamically set parameters and default arguments freely)?
proc( a , b::integer , c:=0 , d::integer:=1 , { e:=2 , f::integer:=3 } ) return a, b, c, d, e, f end proc

Can I do something like it?

How to get the number of parameters of an operator/procedure? Like this.