I just used Bitcoin-Qt client on OS X to send bitcoins for the first time. It did not prompt me to add a fee. I looked into it and found out that the preferences are set to not send a fee. The client should always prompt or have a place to enter a fee, but it is hidden away in preferences. I wanted to include a fee, but it sent before I was given a chance. Now my BTC transaction is in limbo. Why does the client not prompt for a fee?