Merging polygons representing for instance mesh zones can help reducing the number of triangles, particularly small ones, and reduce simulation time. The version of ICM I am using can only merge two polygons at the time. I currently do the polygon merge as part of my data pre-processing before importing the data into ICM as I can merge more than two polygons at the time. However, it would be useful to be able merge several polygons in one go in ICM.
