I want to directly link to the question submit form without the user having to type in anything first. Can I do that?
You sure can! Just append q.php to the end of your LibAnswers URL.
For example, http://demo.libanswers.com/q.php.
You can also embed or link directly to your LibAnswers question form using a widget.
If you're an admin-level user, go to Admin Stuff > Widgets & API > Question Form to grab the code.
If you're not an admin-level user, go to Tools > Widgets & API > Question Form to grab the code.