Sets the creeper flow rate. 0.2 is normal. Lower means slower flow, higher means faster flow. You can't change this value for a single cell only.

The number indicates the amount of a share that gets transferred to neighbour cells. 1.0 indicates that each neighbour gets one fifth (1/5) of the creeper per frame, leaving one fifth (1/5) in the cell. 0.2 would indicate that one twenty fifth (1/25) goes to each neighbour per frame, leaving twenty one twenty fifths (21/25) in the original square. For this reason, if the flow rate is set above 1.25, weird things happen.

SetCreeperFlowRate(0.07)