More user-friendly weight painting

When weights painting in blender, you often need to add and reduce weights, but when these two functions switch between each other and participate in bone switching, the steps become very complicated. In some other software, the weight drawing generally uses the left mouse "Add", Alt + left mouse "Subtract", and Shift + left mouse "Smooth" Just like blender's sculpting mode, you can do left-click “increase”, Ctrl + left mouse “subtract”, and Shift + left mouse “smooth”. The weight drawing mode can also draw on similar ideas. I searched some posts and many users need this feature.