Soft Keys - More Settings

Активизируйте кнопки на экране, наслаждайтесь! Не нужно корень.

Activate the on-screen keys, enjoy it! Don't need root.

simple and easy to use version here :

https://play.google.com/store/apps/details?id=com.dogusumit.softkeys2

source codes here :

https://github.com/dogusumit/SoftKeys-MoreSettings

This app uses Accessibility services.