How many times you found yourself in need of a Calculator while buying /selling using the eBay app on you phone? What most of us do is to minimize the open Windows to gain access the Calculator from the Desktop, if you have a shortcut, or any other means which is a annoying, waste of time and effort. I believe that creating a Shortcut at the top horizontal bar (I'm sure it has another name) to the phone built-in Calculator, or any other Calculator you prefer, will be an added value, especially for Phones and Tablets users. That calculator can be hardcoded to point to the default or any other Calculator that you define as a parameter in the Settings, it depends on the effort the eBay app Developers are allowed to put into this enhancement, assuming it found others who would see a value worth the effort.
Any thoughts...
