I'll post a new version of the script soon in the linked sourceforge thread - the new 6.0 Beta of Snapraid includes access to diff and list, status etc.. without spinning the parity drives. In my case Parity is powered on/off with pre/post script. And I created some functions to clean up the code a bit.
Hope to put my DrivePool Licence to use - but I need the truecrypt support. Just stumbled across this and wanted to let you know that there will be a new version of the powershell script