- last post: 01.01.0001 12:00 AM PDT
Instead of not allowing the post, maybe make it just give a message:
"Topics with similar keywords in the title have been posted, and are still active.
Please post there instead, unless your topic is completely different."
And then have it list the topics.
Of course, we need to decide what 'Active' means, otherwise, it would have to be different for every forum.
(The Flood = 5 minutes without a post, Septagon, 5 days XD.)
[Edited on 2/5/2007]