Default command and command alias

Is it possible to create an alias of a command? For example in the help menu, under "Available commands", there would be something like this:

Available commands:
  search, s                         Do some searching or whatever.
  ...

Also might be related: is it possible to specify a defaut command?

Note that all of the things above are possible with a liberal use of Alternative, but these make the help menu much less appealing:

                                    \/-- looks meh
Usage: surcher [(-p|--port PORT) | COMMAND] [-d|--dir PATH]

Available options:
  -p,--port PORT           Port on which to serve the web interface.  <- this should probably be only visible in the help menu for "serve"
  -h,--help                Show this help text

Available commands:
  search                   Execute a single search with a query.
  s                        Serve a website for searching. <- """""alias"""""
  serve                    Serve a website for searching.

Start by reviewing the command-parsing and help-generation behavior described in the issue, including how Alternative is currently used. Define how command aliases and a default command should affect parsing and help output; done means both behaviors work without duplicating commands or exposing irrelevant options.