Equivalent to Unity's min penetration for penalty?

I am new to UE4 and am trying to smooth out the interaction between physics objects and a landscape mesh. If i have a mesh simulating physics with an octagon shape collider it bounces off the points (to be expected). I am trying to keep the collisions as simple as possible, and in unity adjusting the min penetration for penalty smoothed it out. Like a boulder rolling down a muddy hill instead of a jagged stone surface. Increasing the min penetration seemed to allow more vertices to be to be taken into consideration for the calculation and returned an average (just guessing).

Is there a similar setting in UE4 or is there some better way I should be doing that?