Would it make sense to do something like this:

```ruby
DEFAULT_CONFIG_FLAG_ATTRS = [:c, :config], :desc => 'soyuz config file', :default_value => '.soyuz.yml'

# ...

command 'check' do |c|
  c.flag = *DEFAULT_CONFIG_FLAG_ATTRS
  # ...
end

command 'deploy' do |c|
  c.flag = *DEFAULT_CONFIG_FLAG_ATTRS
  # ...
end
```

A little less easier to grok, but at least it avoids duplication.  Up to you really.