Yeah, I wouldn't manually delete posts - there are several other things which need adjusting and mismatched post counts to board totals and post totals are exactly what cause that blank page issue you have from time to time.
Study the scripts which expire or delete the threads - and you'll see the stuff that needs to be deleted as well.
Off the top of my head:
- Adjust the post/thread count in the boards table. - Any users who have those threads as their favorites - Anybody with post reminders to those threads - Polls, their options and results attached to those posts - File attached to those posts
You don't want all that stuff to get out of sync. There might be more - just thinking out loud.
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