When I press middle mouse button, it opens:
It is so difficult to control the scrolling. Is there any way to disable this?
There's now an extension for this:
Unlike most extensions, it seems you need to restart Chrome for this one to take effect.
Get the latest drivers for your mouse and see if you can reassign the wheel click to a macro through its settings.
It should be reassigned to: Middle-click [very short sleep] ESC
If you can't get drivers with this feature, I suggest you write a very simple script in Autohotkey to do the exact same thing.
It should look something like this:
In your mouse control panel, you need to disable the middle button, if it will allow you to.
The multi-directional cursor vs a standard up/down cursor should also be because your window is too small, and has both vertical and horizontal scroll bars.
If you make your window bigger, the scroll should only be up/down :)