From http://stackoverflow.com/a/26570837/144020 I tried the following:

(define-syntax λ (syntax-rules () ((_ param body ...) (lambda param body ...))))

It works! but ONLY IF you call the script from the gsi not with 

#!/usr/bin/env scheme-r5rs

Does anyone know I can set the command line OPTION s|S "set standard Scheme mode" from within a scheme file??