There is now a Stop button in the playback controls (the square button in the middle) at the bottom of the interface. You can still stop an animation/simulation by clicking the Play button twice and by pressing the Down Arrow key.
The Stop button doesn't speed up the process of stopping the playback, but you only have to click the Stop button once to stop the playback, which may help with heavy scenes where stopping is difficult.
In the Capture Viewport Dialog Box, you can now click the Codec button and set the Quality level for the JPEG files, as you can in the Export Dialog Box (Flipbook) and when you export an image clip from the texture editor.
The default compression quality for JPEG files for flipbook and the texture editor is now set to 100% quality.
