Alias Clips is a Max for Live device that brings the functionality of what are commonly called “alias clips, ghost clips, mirroring” etc. to Ableton Live. It can be a real timesaver when you're working with plenty of small MIDI clips. It lets you control a group of MIDI clips that can exist in the Session and/or Arrangement View. Basically, you can duplicate a MIDI clip and have the original and the duplicates be linked, so that when you modify one of them, the duplicates will automatically update themselves.

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Alias Clips is available for USD 10 from J Garcia's website.

This way for heaps more Max for Live devices & tips.