Is it possible to change the priority of processes and threads in scheduling class SDC

Is it possible to change the priority of processes and threads in scheduling class SDC?Although I think the answer is "no", perhaps there could be an alternative way (maybe via mdb).

# dispadmin -l
CONFIGURED CLASSES
==================

SYS    (System Class)
TS    (Time Sharing)
SDC    (System Duty-Cycle Class)
FSS    (Fair Share)
FX    (Fixed Priority)

# priocntl -l
CONFIGURED CLASSES
==================

SYS (System Class)

TS (Time Sharing)
    Configured TS User Priority Range: -60 through 60

SDC (System Duty-Cycle Class)

FSS (Fair Share)
    Configured FSS User Priority Range: -60 through 60

FX (Fixed priority)
    Configured FX User Priority Range: 0 through 60

The above classes in red doesn't list a possibly configurable priority range.