It has been brought up before and it is a much needed piece of data.

Now, we have to do a shell dump and restart to figure out who's really active and who's not.
I've been kicked off a shell after being offline for less than a day 'cause one of the leaders plays at the opposite time than I do. :O

Related/Semi-Related:
http://forum.square-enix.com/ffxiv/t...-of-LS-members
http://forum.square-enix.com/ffxiv/t...d-Company-list
http://forum.square-enix.com/ffxiv/t...Time-Logged-In
http://forum.square-enix.com/ffxiv/t...for-Linkshells
http://forum.square-enix.com/ffxiv/t...for-Linkshells
http://forum.square-enix.com/ffxiv/t...Info-Displayed
http://forum.square-enix.com/ffxiv/t...for-linkshells
http://forum.square-enix.com/ffxiv/t...ell-Management
http://forum.square-enix.com/ffxiv/t...for-linkshells

....and so on.

So, pretty please Square Enix???