I like that wording a lot more and think you're right about that.
If you are going to target retail business (I think you should) you should keep in mind that most people working retail are young and have other commitments (school, other jobs, etc). For this reason I think having employee-editable "availability" schedules would be a killer feature.
edit: I see that you have a "request day off" feature: is it possible to request just a portion of a day off? Think - "I have an exam that morning but can work at noon"
- In your profile. These are times that you can never work and they are recurring. You can set yourself to be unavailabile every Monday from 2-4pm, for example.
- In the Requests Off section. This section is for one time requests off, as in your exam example.