Suggestion: Custom CSS field

I’ve read some of the threads here, and see that some suggested solutions to css related problems, direct the user to edit the plugin’s css file. Because of the fact that upon any update to the plugin, those custom css fixes would be erased, wouldn’t it be a good idea to include a ‘custom css’ field that users can enter their own css rules and have those rules added to a custom.css file that would not be affected by any updates? The custom.css file could be loaded after the plugin default css file. That would be a very nice feature to include in a future version of this plugin.

http://wordpress.org/plugins/erident-custom-login-and-dashboard/