I just discovered an awesome practice tool.
The Delay.
When working through Mr. Websters three finger tutorials, I learned quite a few things - first and foremost that 1-2-3-2-1-2-3-2 lends itself better to playing 4/4 beats, while playing 1-2-3-1-2-3-1-2 feels a bit odd when you'll play the one with a different finger each time, but it's ultimately more consistent and faster (at least for me, that is).
While sitting there, chugging out consistent 16th notes with my three fingers, I activated a delay, set it to a medium tempo, then played a single note, got a feel for the repeat time, then played two notes, listened, then played four and kept playing. When the playing is perfectly consistent, there is no audible delay at all as long as you stay on the same note. When you get a bit too fast or too slow, the notes sound smeared. I played for a while, then raised the tempo a bit. Then again, until I hit my limit.