I second the use of Getopt::Declare.

I've tried to do a similar thing with Getopt::Long and others, but it never worked out nicely. There's always duplicate data, and it's hard to keep the comments in synch with the options. Getopt::Declare updates the options when I change the usage statement.

I created a toy example for -x accepts up to 3 additional arguments at Re: -x accepts up to 3 additional arguments.