Hi,That's a good suggestion, and a great tip for other users too. We did try to keep the sharing dialog as simple as possible so I can see there being some design required for exposing an advanced option such as this. Rather than giving users the option, perhaps we could always default to always using multiple cores instead...You could also wrap up a tiling workflow as a python script/tool and share that with your users - that might help ensure that they always follow the workflow you would like them use.A better place to suggest enhancements is actually the ArcGIS Ideas site: http://ideas.arcgis.com/ideaList?category=ArcGIS+Desktop. That's the link to Desktop, since it's a desktop-based workflow, but you could tag it runtime as well.CheersMike