I'd suggest wording the typo exception specifically for that -- don't delete because you misspelled "the", delete-repost only if you made a typo that impacts sensitive information like addresses/names, and state clearly in the repost that it's a repost and why the original was deleted.

For anyone reading these comments who's fairly new to LJ -- deleting comments isn't just like deleting comments on other blogs -- the threading breaks down in ways it doesn't elsewhere. Which is why we all are mildly irked at it.