To confirm - RTSM is still there, and so are power state changes.
http://www.symantec.com/business/support/index?page=content&id=DOC5709
pg 12
Managing the power state of computers remotely
You can manage the power state of client computers remotely using WMI, Intel AMT, ASF, IPMI, and DASH technologies. For example, you can turn on the computers before delivering a software package. You can also turn off the computers that have sent critical SNMP alerts to Notification Server
This answers your main question above "My main concern is the power function integration."
Please mark as the solution to the question.