While I am aware that you can add security to an iPad, I replied to the "slide to unlock" feature you mentioned in your post.
You said, " You want to copy the iPad? Touch a button, slide to unlock, and begin working right now, with no slow-down, no chug-chug-chug of swap files..."
The iPad feature of "slide to unlock" is not the same as Enterprise -level security.
"Slide to unclock" is a convenience feature so that user doesn't accidentally unlock the device.
Anyone who has possession of the device can slide to unlock.
Only users who know the log in credentials can unlock a device that has been properly secured in the Enterprise.
I dare say that it will take longer to enter login credentials and verify those credentials than it would to slide to unlock so it would defeat your notion of quick access to the device.
I can however, think of a slide to unlock that would be slightly faster and significantly more secure. That is a fingerprint reader.
Unfortunately, most consumer devices do not inclue one.