VECTOR  go to System Preferences » Keyboard & Mouse » Keyboard Shortcuts.

from there, you can set whatever keyboard shortcuts and combinations that you would like.

hope that helps.  
(Version 3.32)

VECTOR  hey guys...

it's not actually crashing. read this bit from the description above:

"Ping! has no interface -- simply drop a PNG file onto it in order to use it. If you just click the app, it will do nothing (since it has not been given a PNG file to work on.) Sorry for any confusion."

so make sure you're dropping a file or files onto the PING icon. if you're just launching PING from the icon, it won't actually do anything.   
(Version 1.0.1)

VECTOR  it's my understanding that choosing individual files from a torrent before downloading, and transport encryption, are both in development, and will be released in the near future. as soon as those 2 features are implemented, this will for sure be the absolute best torrent app on Macs, if not the best torrent app anywhere. even w/o those 2 features, as is, it's a brilliant app. excellent work.  
(Version 0.72)

VECTOR  i get the same problem. empty folders for all .sit files  
(Version 1.1)

VECTOR  works great, and is super fast.

i had an issue where it wouldn't process more than 1 file at a time, so i emailed the developer.

he emailed me back and posted a new 1.01 build on his site in less than 40 minutes. pure class.

so if anyone else is having the problem of Ping only working on 1 file at a time, go to http://www.paramac.com/?id=ping and grab the new 1.01 version.   
(Version 1.0)