While it sucks that they don't have any plans to adjust mailing (and I can see why they won't), you can already work around this by having your own personal FC and having your alts be part of your FC (you'll just need a friend who can invite your alts to the FC) and using company chest to share items. This is why I personally think FCs should be small and personal, while you use linkshells for larger communities.

Of course it'd be nice if they had something like an account-wide retainer...