Currently when I have a main command with subcommands, the help is rendered like this:

Usage: mycommand [-hqV] [-v]... [COMMAND]

Where the brackets around [COMMAND] signal that the command parameter is optional.
I need it to be required, i.e. the call()/run() method of the main command actually is not used.

Right now I throw an exception inside the call()/run() method and advice the user to specify a command. However I would prefer this to be a declarative setting, also I would like to see the usage help signal the COMMAND parameter as required.