This is not something the forum usually does. There are already several topics similar to you and each time people answered "never log in and that's it".
In reality, nothing prevents getting an exception if the admin agrees. After all, Lauda requested to theymos to ban his/her account and it has been done. So why yes for Lauda and not for philipma1957? That's up to you to convince the admin, héhé.
It's a matter of a few minutes to do it, but if thousands of users request the same thing... that's another problem.
Theymos also have ability to turn user (and all associated posts) into guest with name Anonymous. But it's unclear whether Theymos still accept such request today.
Deleting accounts doesn't mess up any threads, like
this thread. It just changes to anonymous, with no profile information. Post stays intact.
As you can see here, I only change the username to "Anonymous" on request.