Hi Michael,

> Doing some kind of preview would mean something like
> extending the twist command to have an extra stage in
> it, so you'd have to do another action to finish it.

Yep, that's right, I noticed as I was using the twist command that I'd enter an angle and thought, 'nope, that's not what I want......undo and enter another value....not quite...undo and enter another angle.
Extending the command with a preview would be pretty natural as you do with filleting, there are no guide curves like the other commands that you can tweak afterwards because they have history attached to get the desired result.

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