rfm_delay should accept a range of values
rfm_delay allows delay of long-range dolphin IPCs (so called RFM IPCs) by 1 cycle.
This is set by model parameter. 'rfm_delay' set to any value will set the +1 delay. Therefore, rfm_delay=0 will still result in a delay, and rfm_delay=2 will still result in delay of only 1.
RCG should read in the value and apply the specified number of cycles of delay.