I have created a nifty plugin for Cura that adds a new category "Printer Settings" to the sidebar. This category contains many of the machine settings that are normally not available from the GUI eg the Nozzle Size, and settings that could make time estimates more accurate.
Note: Changes made in the sidebar override values set in the machine definition or in the chosen nozzle size variant, and end up in quality profiles. This may have unexpected results. It is not recommend