Getting rid of "Quick Reply" box

I have a portal which is set up for High School students. I am trying to stress the importance of proper spelling and grammar within posts on the portal, but all too often I have students who use the Quick Reply box rather than doing the normal post reply button. Of course when they use the Quick Reply box they do not have access to the SpellCheck button that is available using the post reply feature.
I would like to be able to remove the Quick Reply box, thereby forcing users to click on the post reply button when they wanted to post on my portal. Is there an easy way of doing this? I can't find anything obvious in the ACP and there doesn't seem to be anything posted to these forums on this particular issue.
Thanks!
I would like to be able to remove the Quick Reply box, thereby forcing users to click on the post reply button when they wanted to post on my portal. Is there an easy way of doing this? I can't find anything obvious in the ACP and there doesn't seem to be anything posted to these forums on this particular issue.
Thanks!