Multiple Mask Layers

When I want to mask I typically want to mask more than one thing. Right now only one mask is supported but say I have an email and password field, I have to create a mask over the entire thing. Another thing is that there is a fade in transition for the mask which means even when I place a mask it would be see through for a short, but compromising, period of time. If we could have the option to disabled fade in and out or maybe a bazier curve to control the fade duration