MooseX::MultiInitArg

MX::MultiInitArg is in Moose's subversion repository, and should be  
hitting CPAN shortly (it's been uploaded to PAUSE).  Now you can make  
aliases for your init_args.

has widget => (
   is => 'ro',
   init_args => [qw(twiddler fiddler)],
);

So these are all equivalent:

->new(twiddler => 'whatever')
->new(fiddler => 'whatever')
->new(widget => 'whatever')

and this:
->new(widget => 'foo', fiddler => 'bar')

makes it confess its sins to you.