EFILive beta V7.5.4 (Build 44) and beyond:
RTACS now supports Addition, subtraction, multiplication
and division as well as the
current BEN factor percentage adjustment.
Just add the operator (+, -, * or /) you wish
to use followed by a comma before the first PID name in
the *.RRR key like this: Bxxxx.RRR=+,<pidname> Leave it blank to use the standard BEN factor %.