Currently there is no support for devices other than on and off (0 and 10). The only exception to this is PC's which can be set to hibernate/standby with the use of the Orchestrator software. The main draw back you will find is that with non-Cisco devices, they will not have the Cisco Energywise API installed, and as a result, they will not recognise the different power levels.
Cisco are working on a new series of IP phones which can support these different levels of power which will improve the whole Energywise experience. Im am unsure of the exact feature list, but they will support a standby mode and will allow the switchport to still function when POE has been removed from the switchport. I would expect that they will also be rolling our further intelligence to their AP's/controllers.
Hope this helps