Mask value paint and mask value dropper please?

When transposing part of the mesh with a relatively high resolution, hitting the blur mask button can’t really smooth it up to my need. And painting a smooth mask is difficult. If it’s possible to add a value mode for mask pen ( like, if set paint value to 0.5, anywhere gets painted on will have the mask intensity to approach 0.5 ), and a mask intensity eyedropper.