This is an excellent idea. I would like to add additions to a linkshell such as linkshell level (by doing things such as inviting players or fighting monsters with the linkshell equiped you earn experience for your shell).

Leveling up a linkshell would give you new features such as an optional linkshell bank, and further levels would open up more storage space.

Being able to set a message, and even an in game calendar to schedule events would be excellent.

Thank you,