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You can't turn off the "key lock" functionality (last checked on OS X 10.8.2). You can however install KeyRemap4MacBook, which allows you to make modifier keys sticky without this "key lock".

You can't turn off the "key lock" functionality (last checked on OS X 10.8.2). You can however install KeyRemap4MacBook, which allows you to make modifier keys sticky without this "key lock".

2023 update: KeyRemap4MacBook functionality has been rolled into Karabiner-Elements by the same developer.

You can't turn off the "key lock" functionality (last checked on OS X 10.8.2). You can however install KeyRemap4MacBook, which allows you to make modifier keys sticky without this "key lock".

One caveat: There is a bug in KeyRemap4MacBook (last tested in version 8.0.33) that makes key sticking unreliable when typing fast. It may be fixed in future versions, but until then reliable sticky keys aren't available.

You can't turn off the "key lock" functionality (last checked on OS X 10.8.2). You can however install KeyRemap4MacBook, which allows you to make modifier keys sticky without this "key lock".

You can't turn off the "key lock" functionality (last checked on OS X 10.7.3). You can however install KeyRemap4MacBook, which allows you to make modifier keys sticky without this "key lock".

One caveat: having installed and used version 7.5.0, it hasn't worked well with sequences like ⌘+⇧+{ (next tab) when typed quickly. The ⌘ is forgotten about and I end up typing "{" instead of switching to the next tab.

Thus I conclude that getting useable sticky keys is a massive pain.

You can't turn off the "key lock" functionality (last checked on OS X 10.8.2). You can however install KeyRemap4MacBook, which allows you to make modifier keys sticky without this "key lock".

One caveat: There is a bug in KeyRemap4MacBook (last tested in version 8.0.33) that makes key sticking unreliable when typing fast. It may be fixed in future versions, but until then reliable sticky keys aren't available.