I don't trust dragging order "lines" on charts. Maybe there's a setting I'm missing... but often times the "scale" of the chart along the y-axis changes while I'm in the middle of dragging -- which makes it unnerving to actually release the mouse button. I would not recommend doing this for a security that wasn't highly liquid with a tight bid/ask spread.
This is a huge oversight in functionality on IB'S part.
Why in the hell would you scale the chart as I'm in the middle of sliding an order around?
it's no bug, you will undestand that after ten thousand hours