I can see why people would want to use the same name on a server, but its not really my cup of tea I prefer the simplicity of 1 name. I have like 6 or 7 names I like using on games and some names I made up myself so they are never taken. Probably the issues I had with typing out long names should be fixed in 2.0.

They most likely will add the left click someones name to send them a tell or right click their name to bring up other menu of options like to invite them to party like every other mmo has. For example you see a guy shouting for a Ifrit party click his name in the chat log then type what you want to say to him.