Hi Bruce,
Thanks for your interest in Vacation Request!
In the next release (2.2.6), which I am trying to get out by year-end, I have added a "Help" feature which better documents the function of this button. I decided that I would have had to recreate too much of the logic from Calendar/Scheduling to create repeating appointments in personal calendars.
So I create a single day appointment and allow you to add the repeats if desired. BTW, if you are adding someone else's Leave to your calendar (as a Reminder) you might only want the reminder once even though their leave was for five days (especially if they were going to Lotusphere and you weren't).
HTH,
Bob