[XPERIA X10 General] Karlson2k:
Just checked latest X10, Neo and Arc ROM and found full default settings on it.

Full default settings for X10 (build-in SemcPhone.apk) are here:

<?xml version="1.0" encoding="utf-8"?>
<settings version="1">
<setting key="data-connection-show-popup-when-enabling-data" runtime="false">false</setting>
<setting key="data-connection-except-mms-can-clear-icon" runtime="false">true</setting>
<setting key="data-connection-except-mms-show-icon-when-enabled" runtime="false">false</setting>
<setting key="data-connection-except-mms-show-icon-when-disabled" runtime="false">true</setting>
<setting key="preferred-network-mode-visibility" runtime="false">true</setting>
<setting key="prefer-2g-visibility" runtime="false">false</setting>
<setting key="use-3g-only" runtime="false">false</setting>
<setting key="show-voicemail-notification-text" runtime="false">true</setting>
<setting key="national_data_roaming_visibility" runtime="false">false</setting>
<setting key="national_data_roaming_setting" runtime="false">0</setting>
<setting key="national_data_roaming_warning_enabled" runtime="false">false</setting>
<setting key="carrier-sel-visibility" runtime="false">true</setting>
<setting key="docomo-supplementary-service-setting-text" runtime="false">false</setting>
<setting key="docomo-roaming-voicemail-number" runtime="false">+819031014170</setting>
<setting key="disable-sim-network-pin-dialog" runtime="false">false</setting>
<setting key="add-emergency-call-to-call-log" runtime="false">false</setting>
<setting key="show-setting-for-dual-mic-noise-suppression" runtime="false">false</setting>
<setting key="hac-visibility" runtime="false">false</setting>
<setting key="tty-visibility" runtime="false">false</setting>
<setting key="end-held-call-at-3rd-incoming-call" runtime="false">false</setting>
<setting key="disable-emergency-call-auto-retry-when-sim-locked" runtime="false">false</setting>
<setting key="call-failed-raw-cause-code" runtime="false">false</setting>
</settings>

Full default settings for Arc (build-in SemcPhone.apk) :

<?xml version="1.0" encoding="utf-8"?>
<settings version="1">
<setting key="data-connection-show-popup-when-enabling-data" runtime="false">false</setting>
<setting key="data-connection-except-mms-can-clear-icon" runtime="false">true</setting>
<setting key="data-connection-except-mms-show-icon-when-enabled" runtime="false">false</setting>
<setting key="data-connection-except-mms-show-icon-when-disabled" runtime="false">true</setting>
<setting key="preferred-network-mode-visibility" runtime="false">true</setting>
<setting key="prefer-2g-visibility" runtime="false">false</setting>
<setting key="use-3g-only" runtime="false">false</setting>
<setting key="show-voicemail-notification-text" runtime="false">true</setting>
<setting key="national_data_roaming_visibility" runtime="false">false</setting>
<setting key="national_data_roaming_setting" runtime="false">0</setting>
<setting key="national_data_roaming_warning_enabled" runtime="false">false</setting>
<setting key="carrier-sel-visibility" runtime="false">true</setting>
<setting key="docomo-supplementary-service-setting-text" runtime="false">false</setting>
<setting key="docomo-roaming-voicemail-number" runtime="false">+819031014170</setting>
<setting key="disable-sim-network-pin-dialog" runtime="false">false</setting>
<setting key="add-emergency-call-to-call-log" runtime="false">false</setting>
<setting key="show-setting-for-dual-mic-noise-suppression" runtime="false">true</setting>
<setting key="hac-visibility" runtime="false">false</setting>
<setting key="tty-visibility" runtime="false">false</setting>
<setting key="end-held-call-at-3rd-incoming-call" runtime="false">false</setting>
<setting key="disable-emergency-call-auto-retry-when-sim-locked" runtime="false">false</setting>
<setting key="call-failed-raw-cause-code" runtime="false">false</setting>
<setting key="merge-calls-button-visible" runtime="false">true</setting>
<setting key="dual-mic-noise-suppression-enabled" runtime="false">false</setting>
<setting key="switch-to-manual-search-mode-when-selecting-network" runtime="false">false</setting>
<setting key="disable-ef-csp-bit" runtime="false">false</setting>
<setting key="skt-ask-at-power-on" runtime="false">false</setting>
</settings>

If any stock customized setting are missing in /system/etc/customization/settings/com/android/phone/custom_settings.xml then default value will be used.

Customized settings for Neo and Arc:

<?xml version="1.0" encoding="utf-8"?>
<settings version="402">
<setting key="dual-mic-noise-suppression-enabled" runtime="true">true</setting>
</settings>

So you can safely use xRecovery patch from first post on Neo or Arc/Arc S, but you'll need to manually switch "dual-mic-noise-suppression" in GUI after patch.