[Edit: Issues, Bugs, and Requested Features should be tracked at Google Code, not here -- matt, 2010-04-23]
Less Wrong is still under construction. Please post any bugs or issues with Less Wrong to this thread. Try to keep each comment thread a clean discussion of each bug or issue.
Requested features... sure, go ahead, but bear in mind we may not be able to implement for a while.
I agree with this in principle, but since it's possible to delete single comments manually it would just make it more inconvenient and I don't see much point in that either.
The account is associated with the user's email account and the user might not want to leave the account with its associated information floating around if he/she doesn't intend to use the account anymore. I for one think that account deletion is a useful feature in general and shouldn't be disallowed.