The static dome does not have a hold button and you can not move the grid with the mouse wheel.
In fast markets the grid of the dynamic dome is nervously moving up and down, as it centers around the last trade (see option autocenter price under properties), so you can not put in any orders safely.
You would have to click the Hold button (or space bar) to stabilize the grid first, then put your order in, then press Hold again to relieve it.
The static dome is not supposed to move in the same way, so you do not need the Hold button. Have not used the static dome yet.