From now, you can delegate control of your player by submitting your friend's name in Control delegation form.
From that time, until you click Delete delegation he wil be able to type
So, no longer sharing passwords etc...
Yes, it's the reason why LTXIV has restarted today. And it should be restarted again, as I forgot to specify server identifier when launching civserver, but I'll do it using gdb :).
Note: this feature works in 2.1 based games only. 2.0 based - work in progress.
See also