Supression of alerts from a VmHost powered off by DPM/DRS

A Vm host may show as down in NPM/SAM when it has been put into standby in VMan.  It would be great if NPM/SAM could use the data from VMan to set these hosts as unmanaged so no alerts are raised when DRS/DPM puts them into standby.  Obviously they wouldn't be unmanaged if they were down due to any other reason.  I think at present the data from within vmware isnt collected and so therefore cannot be acted upon by VMan.  This would be a great feature as custoemrs using DPM would not has erroneous alerts raised in NPM and SAM