Good suggestion. In an 'XML-to-domain mapping' (for the response) we have the button 'Generate Entities'.
This 'Generate entities' button is unavailable in the 'Domain-to-XML mapping' (request). We can make this functionality there as well.
The 'Import web service/XML file' button in the Domain Model is essentially a wizard that performs some steps automatically: * create web service * create response mapping + generate entities * create microflow for webservice call
Since 'Generate Entities' is not available yet in the request part, that mapping is skipped. This is somewhat asymmetrical and it would be an improvement if it is implemented there as well.
I'm sorry I can't make any promises on when we will make this, but it has our attention.