with valueOpMult, I think one can model the function abs(a):

 

abs(a) = min_limit_0( a ) valueOpAdd min_limit_0( a valueOpMult -1 )

 

with abs(a), one can define the influence of a 2 dimensional jcm

like min_limit_0( 1 - abs(distance_x)+abs(distance_y) )

 

this leads to the square shaped influence pattern

 

the 2d space is overlappable by squares like shown above, so that the sum of all influencing JCM's is 1 at each point in space (interpolation).

if i can verify this and prototype it into a figure, then this would mean that we indeed can generate ERCs for Poser Legacy ERC