DrRacket (IDE) Features

-

|(+ 1 2)
remove-parens-forward c-c c-b
|+ 1 2

(+ 1 |(+ 3 4))
move-sexp-out c-c c-o 
|(+ 3 4)

(+ |1 2)
kill-enclosing-parens  c-c c-e
+ |1 2