emergency vacations - if you mean like LittleGolem.net has, where if you run out of time, 1 day is added (which I think GoldToken also now does) - I believe Fencer has something like that on his list.

Which basicly lets say something happens (bad weather knocks out power for 5 days) - and you are unable to log on to any comptuer, as long as you have vacation days left, it will automaticly use 1 of them instead of timing out games.