1) Drop down lists in the backend for each entry, this would make multiple entries for the same location much better. For example, if you could select a location from the list and it would autopopulate address info, phone number, etc..
2) Support for custom display on Component page. Right now you are limited to displaying the title of the event and the category of the event on the component page, there is no way to add other categories (like location, contact info, etc.) to the list.
Other than those two issues I have no complaints. It has good support for repeating events, which is really nice, and you can change the way it looks through css.