Ask for confirmation when click on "Install Wordpress"'s button.
On a website that's already installed with Wordpress the button to Install Wordpress still appears and sometimes when you misclick, another installation of wordpress starts.
Please add an option/or directly Ask for confirmation when clicking on "Install Wordpress" because of a mis-click, once the installation starts there is no way to stop it, and it installs on the same website that has already Wordpress installed.
We have redesigned the installation experience and now you cannot accidentally install WordPress anymore (you have to make at least one confirmation click). Enjoy!
+1 on this. It overwrites existing files and index.php with no warning! Just bumped my touchscreen and this happened to a high traffic site.