Being able to set unique parameters for paint weights tool would save a lot of time. I need to use Max strenght = 1 for blending, but 0,1 for add/subtract. Being able to have different parameters for painting and blending would be a huge time saver when painting in, then blending after.
When painting it would be 0,1 (or the set parameter), and when holding shift or having paint blend weights activated, it would be 1 (or the set blend parameter). You could have a bool for "use same parameters" or something similar if you want them to be linked.