I do not intend to use Mask Modifier because I have a hair mesh that contains 5-10 layers on top of each other and I would rather work with two mesh surfaces that are stacked visibly in edit/Weight paint mode and hide the rest so I can see better where it deforms when I posed it.
I selected the group from the underneath of the surface mesh that I want to mask and paint weight over however I noticed that I could not select different bones once I turned on the Vertex Selection Mode.
OFC I can go through different vextex group but I find it very tedious to scroll through every time especially when it is a long list.
It would be easier if there is such feature that allow user to shift different bones while the vertex selection masking is active under Paint Weight.
If it is not possible, what is the hotkey for vertex selection ??