I split the overall mesh in Modo since the edge selection tools are superb. But is there some similiar approach in Rhino for Meshes when e.g. you select 2 edges in one continuous row? Thanks for your advice!
No I don’t think so, Rhino doesn’t have edge loop or edge ring selection options for polygonal meshes. I think these are mainly useful on quad models which get a subdivision surface modifier. Rhino may support something like this once the sub-d project gets more attention but right now Rhino is more geared to working with the random tri meshes you’d get from scan data.