I want to type something like \'scheme file.scm\' and have it interpret the file, and then take me back to my shell, rather than loading it in the REPL.
edit: I trie
I think what you want is SCM. You can execute a .scm script like this:
$ scm -f foo.scm arg1 arg2 arg3
See http://people.csail.mit.edu/jaffer/scm_3.html#SEC28 for more details.
The SCM homepage: http://people.csail.mit.edu/jaffer/SCM