I'm not sure whether this counts as an answer.  I put this definition in a 
file that my leiningen project loads by default:

(defn set-pprint-width 
  "Sets width for pretty-printing with pprint and pp."
  [cols] 
  (alter-var-root 
    #'clojure.pprint/*print-right-margin* 
    (constantly cols)))

Then I can use the function to set *print-right-margin* to whatever default 
I want in some file that's loaded by default.

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