I looked at this module last night and it's interesting, but it's too generic. I'd have to write too much of my own code to make this work, which is what I was hoping to avoid. I started poking around in Getopts::* on CPAN and did find a module that comes close to what I want, but not quite: Getopt::Casual.

This module just parses a command line pulling out anything that looks like an option/switch/flag/whatever and uses some heuristics to decide if the following argument should be considered a value for that option/switch/... or not. Unfortunately one of those heuristics is exactly the opposite of what I want, so I think I'll give up and write my own code for this.