still puzzled about the way instruments work (rel. 0.9.5)

Finally some nice features in this release. Keep up the good work!

I'm still puzzled about the correct way to handle instrument settings. I alse detect some strange things (see attached file):

1) first, look at the instrument names in Create -> Instruments. I created those using a "tuned" version of instruments.xml in release 0.9.4.
2) then look at the short and long names i used in the part. Can be edited by right-clicking a bar and choose "Edit system properties...".
3) finally look at the instruments in the mixer-panel. Those are the instrument names, not the long/short names. And where do the extra instruments come from??? How can i delete (or show??) them ??

There is also an Edit button in the Create/Instruments panel. What is the purpose of this function?

I hope someone can give me guidelines on this issue.