I just wanted to raise the subject of locking threads at the 'authors' request. While the "Forum Suggestion" thread prompted this, it's worth mentioning that I wasn't bothered at all when that thread was locked, it was just the catalyst.
It just occured to me that's it wrong to lock a thread when the 'author' requests it. While a single user may be responsible for starting a discussion, they don't own it, and the thread isn't there solely for their benefit. Each thread becomes a discussion between multiple parties that nobody had a right to end, unless it breaks the forum regulations. The only exception I can think of is when the thread starter has become embarassed for some reason (e.g. they've started a thread "I've split up with my girlfriend, help!" and realised how much of a plum it makes them look).
There have been a few threads in the past, locked for no other reason than 'author's request' that I've wanted to contribute too, but couldn't. My opinion is there's no such thing as a single thread author. Everyone who contributes to it has a right to continue discussing the subject while it adheres to the AUP.