A few days ago I saw a tutorial about building a custom panel with brushes and actions.
That method, based on Adobe Configurator, only works in older Photoshop versions because those panels rely on Flash. There is no direct alternative for newer versions.
So I decided to prototype my own HTML5 panel in a day, with buttons for favorite brushes.
The idea is actually simple.
There is a folder with brush previews (PNG, JPEG, etc.). File names must exactly match brush names. The plugin reads that folder, renders all images in the panel, and when you click an image, it activates the brush with the same name.
The preview image can be anything, but the file name must match the brush name exactly (spaces, dashes, upper/lower case). That is why it is better not to use Save for Web: it replaces spaces with dashes and Photoshop may no longer find the right brush.
I do not paint much these days and I am not sure how many people still need this panel, but if there is interest I can continue improving it.