How to keep SoapUI request settings in a single place?

I have created a project with a bunch of "HTTP Request" test steps. Each http request uses basic auth. When I specify username/password values in Auth request tab, all works fine: How to keep these settings in a single place per a project and don't change each request if username changed?

I tried property expansion feature, and it doesn't work in Auth tab.

Actually I have a solution: project file is a readable XML, so it is easy to replace username/password values (or service URL... everything) in external text editor. Hope for a better way.