Use /dev/random before encrypting disks?

[Alexander Todorov <atodorov redhat com>]

Hello all,
in many disk encryption resources on the web the user is given an advice 
to use /dev/random to populate the disk before he sets up the encryption 
 process. This is said to increase entropy and recommended for brand 
new disks.

Does anaconda have the support for that in the current block device 
encryption implementation? I guess not but haven't looked at the code.
IMO a GIU/TUI/kickstart flag is enough to let the user choose if they 
want to populate the device with random data prior to encryption.
What do you think?

Thanks,
Alexander.