It's a good idea, but it's not part of Q2A yet.
However version 1.4 will include a new set of functions (in a file named qa-app-posts.php) which make it much easier to programmatically create and manipulate content within Q2A. There will also be new functions for temporarily suspending notifications, indexing, etc... Combined with the existing functions in qa-app-users-edit.php, these will make it really easy to write a script which auto-generates dummy users and content.
Perhaps someone will do this as a plugin, wrapped in a custom page module?