I see two immediate issues with the plugins listed above.
For the music one for dispensers created by the engineer would require us downloading even more files to join the servers. This will likely cause players to want to leave rather than to continue to stay when their internet connection is probably not one of the greatest. The second issue is that None of these plugins have been approved, meaning there are likely to be more full of bugs, lack of proper code structure, etc.. This can lead to a lot more server crashes. The cost does not seem to out weight the benefits in my opinion.
Hades