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Available in version 41 and later. (for new IRPL commands)
SetCreeperInArea(<-area <-creeper <-probability <-isRound)
Sets creeper in area. Area: A V4 specifying the lower left and upper right of an area. Creeper: A creeper int amount. Probability: A float in the range of 0 to 1 indicating the probability creeper will be deposited in a cell. IsRound: When true, the area specifies an elliptical area. When false, a rectangular area.
SetCreeperInArea(V4(5 10 20 20), 100 1000000 *, 0.5 true)