Apply fade in/out to multiple clips in a batch

Often I'm editing tutorials with many cuts that need a quick fade in/out at the top and bottom of each clip to avoid discontinuity pops. I would love to be able to apply a fade in/out to each one by a variable number of milliseconds and shape to speed up my audio editing. At the moment I can make a custom keyboard shortcut for the fade in and a separate one for the fade out, but you can't adjust the amount of time the fade takes, so it's always too long of a fade and I have to adjust it manually anyway, so it's not much of a shortcut.