It does, but not really. Your never going to be able to percisely control the fade without a pressure sensitive tablet.
Seriously, get yourself a tablet and you’ll wonder how you ever worked without it. I have a 6x11 Wacom, which are of the utmost quality. But before that I had a really cheap one from AIPtek, you can get them for like $70 and under, hell, I’d even sell you my old one (12x9) that still works like new for super cheap. If you have the money though, get an Intuous 3 from Wacom. Either way, even if you go for a cheapo, it’s a thousand times better than working with a mouse when your using ZBrush or Photoshop, etc…
I can 100% guarantee you that your work will improve ten fold once you get a tablet.