HT4718 FileVault 2, the Recovery System, and the use of Disk Utility

I have FileVault 2 turned on for my Lion-equipped Powerbook Pro. When booting from the Recovery System, however, the Disk Utility thereon cannot even verify the internal HD, much less repair anything. I am aware that this is due to the encryption, of course.
However, for external encrypted drives, all I need to do is enter the password to mount them. So is there something that one can do in order to get the Disk Utility on the Recovery System -- on this very same drive -- to recognize the main volume, in order to enable it to perform diagnostics?
Secondarily, if I put the Powerbook Pro into target mode, and connect it to another Mac (which I have not tried yet) will I be able to mount it from the other computer if (A) It is running Lion OSX or higher, and (B) I can provide one or more of the login passwords?
I am one who has always liked to keep my hard drives running smoothly (e.g using Disk Warrior, Drive Genius, Disk Utility...whatever). So this is a bit foreign to me to be unable to run at least basic diagnostics. Any input would be appreciated. Thanks.

If you're talking about just the Recovery HD, you only need 1GB so use a 4GB USB thumb drive and the OS X Recovery Disk Assistant to create it.
If you're talking about the ML installer (installESD.dmg) use an 8GB USB thumb drive.

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