Yes, we do. We indeed implemented that idea a few weeks later, but with a different (and hopefully better) approach. Open your parent forum and then go to "Options > Users > Who can view & post?" and then select one of the options below:
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Everyone can participate, but restricted topicsor
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Registered users can participate, but restricted topicsThese two options solve the problem. The "New Topic" link won't disappear from the parent forum page, but it will ask you to choose in which sub-forum your message will be posted to.
A real example:
http://n2.nabble.com/RURAL-MAIL-TALK-f581397.html(try clicking on the "New Topic" link and you will see what I am talking about)
PS. The next release will make this configuration more clear to the user.