Hello Graham,
Yes you can view the contents of an RPM in Midnight Commander.
Just go to the file with the cursor, hit ENTER and you will see some directories, files and scripts. Some RPM's have the directory-structure of the installed files right there, others have a file called CONTENTS.cpio. When you hit ENTER there, you will see the directory-structure with the installable files. The directory INFO in the RPM root contains more information about the program.
Good luck,
Pieter