Currently i observe
1) The macro does not provide an ability to select the space as well as the topics, so questions that are private to a space can not be displayed?
2) The ask question button of the macro does not automatically assign questions to a space or provide the ability to determine if a question global or in a space.
Is there a way to ask and display question private to a space?
This is a feature added to the last version of the Confluence Questions plugin. The user is asked to specify the Space a question should go to.
Additionally, every Space now has a Questions area of it's own. Questions asked there are automatically added to the correct Space.
You can administer the associated Spaces at any time.