Using the default emacs keybinding for IntelliJ 11.1 on os x I attempt go back a word using M-B (or literally option-B) instead of moving back a word the unicode integral symbol is entered. M-B (option-B) works fine in my emacs install.
Download this keyboard layout: https://github.com/idf/dotfiles/blob/master/keylayout/OptDisabled.keylayout
To enable your new layout you must save it into your '~/Library/Keyboard Layouts', and then enable it from System Preferences -> Keyboard -> Input Sources.
Then, with this keyboard layout, you can use meta keys in IntelliJ.
It looks like JDK 8u60 solves this issue. https://youtrack.jetbrains.com/issue/IDEA-17392#comment=27-983397
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