It would be really convenient to add input mapping for some more properties of the Call REST Service task.
Currently only the OAuth Token is mapped.

This way I can use workflow properties to modify the settings.

For instance:
- Connect Timeout
- Socket Timeout
- User name
- Password

And if possible, add:
- Request method
When I am able to map the Request method as well, I would be able to re-use a generic sub-workflow which would be able to handle all kinds of REST calls. All the payload handling and error handling surrounding a REST call, would be handled by a single workflow.