Dear Paul:
Yes in our system we can set the following SF to different values to free up power and code for the voice users.
As we know in code tree the code are reused in the same branch .
So by blocking 2 codes out of 8 ,you free up 1/4 of resources
parameter Range
SF8adm 0 to 8
SF16adm 0 to 16
SF32adm 0 TO 32
Thanks