I hope that this feature is being worked on. I've been waiting a long time for this and without it Rizom is much much less useful to me. The ability to cut up a shell how I want and then copy all the matching geometry onto it is extremely necessary to saving time. This means copying the similar area from already existing shells which may not match the cuts and polygon counts IE extracting the area from shells and geometry, it needs to find the matches when meshes and shells are scaled differently, mirrored, rotated, part of a larger shell or piece of geometry. I've often got repeated geometry on meshes that don't make sense to uv map individually. The clone selection and similar shells stuff that is currently in Rizom does not work properly, it defeats the purpose if I have to make sure every shell is already cut exactly the same before they will be matched up, the whole idea is to not have to slice every copy manually. The current features also don't work on more complex shapes that need to be cut into multiple shells instead of one contiguous shell(unless you manually cut each shell into matching segments), the process right not is too complex to make it useful in most cases. Rizom has so many good features but without appropriate UV copying and selection of duplicate geometry and shells I have to go to headus uvlayout to get these features. I really urge you to take another look at how these features currently function and how they actually need to function, it's almost right but it's missing the mark.