in reply to OO APIs and FP interfaces

How should I subclass Ex::Mod (or is it Ex::mod?) by adding a new parameter, e.g. perm? %conf is lexical in the package and the conf sub only operates on its keys that I can't change. 
($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,

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In Section Meditations