I often use this tool when working in expert mode as it gives the user a small floating window that allows them to access the playback tools of the timeline.
NOTE: This script is part of the latest collection of JJTools for 3ds max 7. If you are using a prior version of max - you should download the appropriate script package to ensure full compatibility.
JJTools6 for 3ds max 6 users
JJTools5 for 3ds max 5 users
JJTools4 for 3ds max 4 users