Which of these code changes are 'safe'/correct?

[merk]

The code dealing with $vbulletin->url has nothing to do with closed threads.

The logic is as follows:

Is the thread visible (not moderated) or is the user a moderator?

YES! --> Go to that post if its 'after' your last read post in that thread, otherwise go to the newest unread post

NO! --> The thread went into the moderation queue and the user cant see the thread again, so redirect to the forum.

I see no reason modifying your url wont change anything.