I’ve found that both, vertex painting as well as the “Tint” Tool, have the same effect. In both cases you first have to go to “Edit Mode” and click on “Vertex Selection”
, then switch to “Vertex Paint Mode” an turn “Vertex Selection Mask”
on. Now you can either paint in “Vertex Paint Mode” or use the “Tint” tool in “Draw Mode” in order to limit your color to the selected vertices.