Hello,
In our opinion YES the "jumping up and down" would be greatly distracting.
In product scenarios any screen moment for data entry clerks has caused
significantly less efficiency in there workload
i.e. Betty in Accounts Payable has a semi-Heads Down process where as
she must re-key 10's or 100's of documents data.
Every time the screen jumps, her peripheral vision picks this up, and she
looks at the screen thus slowing down her typing and input.
HOWEVER
If we had the ability to MAP keyboard
http://www.extjs.com/products/extjs/ with the Keyboard navigation this would resolve what I believe to
be a bad result of the Screen Jumping