The very basic use of Flurry is the most important and unless you have some very important event you need to track then I wouldn't worry about it to start. One

The very basic use of Flurry is the most important and unless you have some very important event you need to track then I wouldn't worry about it to start. One case I needed to use custom events was when I had a big operation that could be canceled out of within the app. I used custom events to track how many people started compared to finished which was helpful.