Customize the repeat list?

Is there any way to customize the repeat list when an iCal Alarm pops up? For instance, right now it gives you options to repeat in 1, 5, 15, or 30 minutes, 1 or 2 hours, 1 day, 1 week, or to repeat 1 hour, 2 hours, or 1 day before the event. I'd really like to tell it to remind me again in 2 days, or 3 days, etc. Is there some way to access that list that iCal draws from and add some other options?