Hi TLiaD, thank you for the support and feedback
For transitioning of the brushes from the set, you can choose the 'forward' instead of 'static' in the dropdown so that it will automatically iterate to the set of brushes going forward. The static is for you to manually switch the brushes, you may also use a hotkey 'space + q' or 'space + w' for previous and next button.
Regarding the extension not appearing both in the menu, ill have to check on that why it wont appear. But for now, please make use of the hotkey(Edit > Keyboard Shortcuts) to open both.
Space + L for Live Brush
Ctrl + L for Live Draw
Please let me know if that helps.