I've got a new idea to implement into the gameplay: A "Postpone Game" option.
Whenever someone knows they won't be able to play for longer than 24 hours, they can choose the "Postpone" option, and then choose a length between 24 hours and 2 weeks.
Then, all of the other players have the option to accept or decline the postpone. They have until the end of the round to make a decision, otherwise they'll choose "Accept" by default.
Only if EVERY player chooses "Accept" will the game officially be postponed. This means that no one can take a turn for that length, but no one will miss their turns.
This option will be VERY useful in private games and games with 2 or 3 players left. When the game is getting down to the wire, this option will prevent vacations from ruining the game for someone. This occasion may be rare, but it can't hurt to implement this option, since any one person can decline the postpone.
Opinions?
EDIT: Forgot my priority. I'd say 2/5. It's by no means required, but I feel like it could help unfortunate situations where someone has to forfeit the game for other things...