The app already allows you to take pictures, scan barcodes, get GPS, etc. But Smartsheets is not all about borings stuff, it should also include the exciting world of engineering!!
I would like the field engineers to collect measurements and other numerical data. Often times it may be a more complex concept like the area of an odd shape or room—something that is more than length×width. They would need to switch over to a calculator app but Smartsheet app will lose its place when they switch back.
Either add a pop-up calculator (if the built in android/ios calculator allows) or switch over to the system calculator and back, and automatically pasting the last calculation right into the cell.