ical alarm questions

i'm currently running ical 2.0.5 on tiger. i have a couple of questions related to ical and it's alarms.

1. is there a way to set alarms for unrelated events to go off at 5 minutes beforehand (for instance, a dentist appointment and a football game)?

2. i heard there is a way to set alarms to events on subscribed calendars via applescript. i read this, which sounded like going somewhere, but was still confusing. i would like to know how to set this up for a sosumi sound 5 minutes before each occurance.

thanks for the help and hope to hear an answer soon.