I can't see why people should have all that rush in switching their kernel to 64bit...

you should know that the system can benefit of 64bit apps even with the 32bit kernel loaded, so what's the point of this app? have you any benchmark that proves that the system runs REALLY faster with the 64bit kernel loaded?

I don't want to be mean, but apple knows what they do, if they set the default to 32bit it's because of serious compability issues, and if you publish an app that changes this behaviour you should AT LEAST warn your users that things may not work properly... not everyone's a geek you know.

cheers, L.