iCal attachment on reservation confirmed & notify

Maybe there's already a solution to this but I thought to ask nonetheless.

The reservation system works very well but one thing that could be a great advantage, not the least for customers, would be if the reservation confirmation mai also sent a long an iCal attachment. This would greatly simplify things for both the restaurant but perhaps more anyone who had reserved a table.

A second feature I think would have been cool was a notification from the reservation system, configurable (from admin side) and with an option/check box where the customer could decide if he/she wanted to receive a notification and how long time in advance :)

Cheers & Thanks.