This seems like a combination of a feature request and bug report. If you have multiple tokens you can click on the initiative of each in the turn tracker and update them without pressing enter. When you do press enter only the token whose input box currently has focus is updated.
1. Add multiple tokens none already exist.
2. Open the Turn Tracker.
3. Click on the first token initiative and change it's initiative. Don't press enter.
4. Click on the next token's initiative and change it. Press enter.
5. Only the second token's initiative is updated and the first tokens initiative is not saved.
Functionality wise I would expect the token's initiative to update when I press enter, tab, or the input loses focus.
Chrome 18.0.1025.162, Windows 7