Grease Pencil Animator Desk is a set of panels and buttons, designed for better workflow with drawn animation.
Co-created with Kevin C. Burke (@blastframe)

Features of version 1.9.1:

Additional navigation and layout buttons on 3dView:

More traditonal Onion Skin switcher:

"Draw with Hints" display mode - system of hints helping to keep order and direction of drawn strokes - and prepare better keyframes for automatic inbetweens

Reference system - panel for transforming and managing reference drawings without leaving Drawing Mode (useful for Shift'n'Trace). Now you can also manage your imported Image References throug it.

Easy Onion Skin color setup with 4 presets for fast switching:

Extended options for managing frames:

Fast switching between most used tools, without manual changing interaction modes - in form of overlayed side buttons or Toolbox panel.

         OR     

You can setup direct hotkeys for tools in Add-on Preferences. 

Buttons for setting animation range and FPS - placed on Timeline window Header

You can now customize the interface the way it will fit perfectly to your needs, balancing your workflow between tablet and keyboard.
This options are thanks to Kevin C. Burke (@blastframe). Check Blender Market page of this great artist and add-on developer.

Enjoy, and feel free to contact me with any question or suggestion.
or write on the Blender Artists forum,
Link to thread about this add-on:

https://blenderartists.org/t/gp-animator-desk/