In the previous versions of Adobe Reader there was (as far as I remember) something that might be called "dynamic scrolling. I could use this by holding middle button of mouse and moving mouse up or down what caused the page to scroll. I can't find where to enable it in version 7 of Adobe Reader and I can't stand scrolling pages with 'wheel.
Somebody can help me?

Reader 7 changed the behaviour of the mouse wheel from scroll to zoom. I don't think that there is a way to change the setting.
I tend to just grab the scroll bar and move that now.
Also, you might want to give Automatic Scrolling a go.