Apple’s been known to sneak functionality into applications by adding basic keyboard shortcuts like holding down the option key to provide alternative information. They’ve done it again in Launchpad. Instead of holding down the mouse button on an application to engage the ability to move or delete applications, all you have to do is press and hold the option key.
It may not save you a lot of time, but it’ll certainly come in handy when you need to delete something quickly and move on. Pushing and releasing the option key will toggle the delete and move functionality on and off again. Push and it’s on. Release and it’s off.
Note: Keep in mind that you can only delete applications that have been purchased in the Mac App Store from Launchpad