As Im working on projects, I realized its a PITA to have to go into the material's properties, and adjust the transparency by hand. Is there an easier way to do this? Blendshape, MEL script, etc? Something that can be adjusted by a slider of some sort.

Its just annoying to have to change the transparency to something like 0.3, make a few adjustments according to my ref image, then go back in, and put it back to 0 once Im done..... thoughts?