Below is 'lasso' mode for selecting items in a chart. It is ONLY available in 'DONE' mode, not in 'EDIT' mode. However, if you make selections from a lasso (or anything else) , and then go to 'edit' mode, the objects in edit more will be locked into the last selection.
Also check out the Selections Tool in Sense. The selections tool is an extension of the selections bar. In the selections tool you get an overview of all the dimensions and fields in the app, not only the dimensions that have selections. The selections tool gives a more detailed view of the selected data, so that you can explore the associations in the data even if the dimensions are not used on any sheet.