It would be great to have another toolbar that functions as an additional software keyboard with the Control, Alt, Shift, Tab, and arrow keys. This has two advantages, one that precise selections could be made by pressing Shift and the arrow keys and another is that keyboard shortcuts could be easily used by the soft keyboard. If it could be customized with a few more additional keys, such as square brackets, parentheses, etc., it would be perfect. The Acode Editor Android app for example has this feature implemented and it is really very useful (Attachment screenshot).