Allow a option to switch from Function keys tab navigation to number key navigation

**Is your feature request related to a problem? Please describe.**
Function keys are a being used as the major navigation methods between the tabs. That is not a problem in anyway.

**Describe the solution you'd like**
Add a option or config which can either allow the user to customize the keybindings or allow a toggle which switch function key navigation to number keys.

**Additional context**

Start by tracing the existing function-key tab navigation and the configuration or keybinding entry points that control it. Define how the toggle or customization should select number-key navigation, then verify that the chosen setting changes tab navigation consistently and is covered by tests.

Written by the indexing model from the issue text.