1. Instead of having the obscure "copy track data" feature, why not simplify the buttons in indicator-sound to something like
http://imgur.com/ueC7X.jpg and add a fourth button indicating that it will copy the data to the clipboard.
2. Have copied items handled by the OS itself and not be application specific, as mentioned before, it is rather irksome to lose copied data after the closure of an application.
3. Add an entry to the right click dialog that is labeled "Paste Recent." This entry would contain the last 5 or so copied items and have an entry at the bottom to clear the recent copy history.
This seems to be the least intrusive and straight forward method and it would clear up several issues at once.