Sometimes a thread may lay dormant for a month or more only for the originator to come back and ask further questions, re-start the project which has been interupted by work, domestic activities or whatever, or even say "hey thanks guys, I got it working at last!".
On that basis I dont like the idea of locking threads which have no replies for a month.
Alternatively, would it be possible to lock a thread to all except the originator, say after one month with no new posts. That way the thread could be re-opened to allow for the situations which I described above.
JimB