Docs: Document Zero key hotkey alias for Escape
@@ -3343,10 +3343,16 @@ the default boot entry choice will remain changed until the next manual reconfig
\emph{Note 1}: The \texttt{KeySupport}, \texttt{OpenUsbKbDxe}, or similar drivers are required for key
handling. However, not all of the key handling functions can be implemented on several types of firmware.
- \emph{Note 2}: In addition to \texttt{OPT}, OpenCore supports using the \texttt{Escape} key to display
- the OpenCore picker when \texttt{ShowPicker} is disabled. This key exists for the \texttt{Apple} picker
- mode as well as for firmware that fail to report held \texttt{OPT} keys on PS/2 keyboards, requiring
- multiple presses of the \texttt{Escape} key to access the OpenCore picker.
+ \emph{Note 2}: In addition to \texttt{OPT}, OpenCore supports using both the \texttt{Escape}
+ and \texttt{Zero} keys to enter the OpenCore picker when \texttt{ShowPicker} is disabled.
+ \texttt{Escape} exists to support co-existence with the Apple picker (including OpenCore \texttt{Apple}
+ picker mode) and to support firmware that fails to report held \texttt{OPT} key, as on some PS/2 keyboards.
+ In addition, \texttt{Zero} is provided to support systems on which \texttt{Escape} is already assigned to
+ some other pre-boot firmware feature. In systems which do not require \texttt{KeySupport}, pressing and
+ holding one of these keys from after power on until the picker appears should always be successful. The
+ same should apply when using \texttt{KeySupport} mode if it is correctly configured for the system, i.e.
+ with a long enough \texttt{KeyForgetThreshold}. If pressing and holding the key is not successful to reliably
+ enter the picker, multiple repeated keypresses may be tried instead.
\emph{Note 3}: On Macs with problematic GOP, it may be difficult to access the Apple picker.
The \texttt{BootKicker} utility can be blessed to workaround this problem even without loading
