The gallows intrusion, the baseline jumps and multipass

[ReneZ]

One challenge would be that some long words show an upward or downward trend in their baseline. On the assumption that such words were written at one time, this would show that the scribe simply "wandered" up and down.

Exactly!
I asked the question about baseline jumps to Lisa just a few weeks ago. She was not yet ready to draw any major conclusions from this, and suggested that this might just indicate a short break in the writing.
She may want to comment here herself.

The wandering up or down seems interesting to me if there is evidence that the scribe is actually capable of maintaining a straight line if he wanted.