  WilliamDLB,   You are correct, SCG integration into OME only allows for 1 credential in the credential profile, so if the situation is that they all have unique passwords, then the options would be either1) Use OME-Services pluginor 2) Discover each device in SCG manually   Let me know if this helps.    
We have just enabled the SCG integration to OME using the Adapter.  But when you define an adapter you can only add one Credential Profile.   A Credential Profile can only have one credential of each type. So the one iDRAC that OME is configured with that has a password that matches the one iDRAC credential we can put into the Credential Profile for the Adapter to OME comes up as Success.  All the other iDRACs (which all have unique passwords *of course*) come up as Failed. Did I miss something or is the SCG credential concept terribly broken?   If we can't apply individual credentials through the Adapter to OME, we will have to revert to the OME plug-in and drop all the PowerEdge systems from SCG.
OME Integration - only one Credential Profile, with one iDRAC credential