Selling all un-used land with a single click in a city

[efyin]

Would you please add a button to sell all un-used land? I am frequently having issues of some un-used land hidden behind buildings which is not easy to keep track. When you go to sell a plot of land, can you please give an option to sell all available land in that city?

I also think currently land buying and selling selection can be expanded from 3x3 or 1x1 to reduce amount of clicks you need.