Idea:
Add an are you sure message when you try to deny a party invite.
More information:
Have you ever been trying to get into a party with someone, they try to invite you, and you accidentally deny it? Well I think that this would be very useful, as I have done this on several occasions. Maybe it says something like:
Are you sure you would like to deny -users- party invite? They will not be able to invite you again for -X- amount of time. If so, then click again.
This would be a very small but useful change. Anyway, thanks for reading, and please leave feedback!