As far as I know, there is no method to force Acrobat into read mode as it's default mode. You should be able to hide the navigation pane on the left and the tools pane on the right however. There are narrow bars with triangles right next to these UI elements. When you click there, the respective pane gets hidden - and will stay hidden until you show it again. All you see is that narrow strip with the rectangle on it. To set the default zoom level (which will be used unless the document overrides it) go into Acrobat's preferences, go to the Page Display category and set the default zoom level to 100%.
Karl Heinz Kremer
PDF Acrobatics Without a Net
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