Create a user for a webservice automatically

My plugin need to let an external web service talk to moodle. Asking the admin do all the steps manually is a bit cumbersome and much more difficult than just configuring three fields for a usual plugin. Is it ok to do the following automatically in the plugin install.php or are there technical or security issues?

• Create a webservice user
• Create a system role with the required capabilities
• Assign the system role to the user
• Give the user permission to use the web service
• Generate a token for that user

Is there an example that does a similar thing?Am I missing some steps?

Thanks