This has been suggested in a few places but I wanted a post to call this out specifically. When crafting you have to exit the crafting interface completely to switch linkshells. While crafting may seem exciting it is not. Chatting with your friends on Linkshells is the only recourse for this tedious bit of leveling.

Please add the ability to switch linkshells via chat command with:

/1
/2
/3

This is a major annoyance with what could be solved simply. It is one of the things that I find to be infuriating.

Many other good suggestions in this thread: http://forum.square-enix.com/ffxiv/threads/18733-dev1005-dev1026-Changing-the-user-interface-or-adding-options-that-fits-keyboards?highlight=switch+linkshells