diff --git a/_debug_replacements.php b/_debug_replacements.php
index 5363312..3e99899 100644
--- a/_debug_replacements.php
+++ b/_debug_replacements.php
@@ -93,4 +93,6 @@ return [
 	'theme' => 0,
 	'pwlock' => 0,
 	'access_name' => 'espterm',
+
+	'allow_decopt_12' => 0,
 ];
diff --git a/lang/en.php b/lang/en.php
index 9333add..a4b4ccf 100644
--- a/lang/en.php
+++ b/lang/en.php
@@ -61,30 +61,31 @@ return [
 		colors and hex (#FFFFFF) for True Color (24-bit).
 		',
 
-	'term.fgbg_presets' => 'Presets',
+	'term.fgbg_presets' => 'Defaults Presets',
 	'term.color_scheme' => 'Color Scheme',
 	'term.reset_screen' => 'Reset screen & parser',
-	'term.term_title' => 'Header text',
+	'term.term_title' => 'Header Text',
 	'term.term_width' => 'Width',
 	'term.term_height' => 'Height',
-	'term.buttons' => 'Button labels',
-	'term.theme' => 'Color palette',
-	'term.cursor_shape' => 'Cursor style',
-	'term.parser_tout_ms' => 'Parser timeout',
-	'term.display_tout_ms' => 'Redraw delay',
-	'term.display_cooldown_ms' => 'Redraw cooldown',
+	'term.buttons' => 'Button Labels',
+	'term.theme' => 'Color Palette',
+	'term.cursor_shape' => 'Cursor Style',
+	'term.parser_tout_ms' => 'Parser Timeout',
+	'term.display_tout_ms' => 'Redraw Delay',
+	'term.display_cooldown_ms' => 'Redraw Cooldown',
+	'term.allow_decopt_12' => 'Allow \e?12h/l',
 	'term.fn_alt_mode' => 'SS3 Fn keys',
 	'term.show_config_links' => 'Show nav links',
 	'term.show_buttons' => 'Show buttons',
 	'term.loopback' => 'Local Echo (<span style="text-decoration:overline">SRM</span>)',
 	'term.crlf_mode' => 'Enter = CR+LF (LNM)',
-	'term.want_all_fn' => 'Capture all keys<br>(F5, F11, F12…)',
+	'term.want_all_fn' => 'Capture F5, F11, F12',
 	'term.button_msgs' => 'Button codes<br>(ASCII, dec, CSV)',
-	'term.color_fg' => 'Default fg.',
-	'term.color_bg' => 'Default bg.',
+	'term.color_fg' => 'Default Fg.',
+	'term.color_bg' => 'Default Bg.',
 	'term.color_fg_prev' => 'Foreground',
 	'term.color_bg_prev' => 'Background',
-	'term.colors_preview' => 'Defaults',
+	'term.colors_preview' => '',
 
 	'cursor.block_blink' => 'Block, blinking',
     'cursor.block_steady' => 'Block, steady',
diff --git a/pages/cfg_term.php b/pages/cfg_term.php
index 5993342..51fe377 100644
--- a/pages/cfg_term.php
+++ b/pages/cfg_term.php
@@ -288,6 +288,12 @@
 		<input type="hidden" id="show_config_links" name="show_config_links" value="%show_config_links%">
 	</div>
 
+	<div class="Row checkbox" >
+		<label><?= tr('term.allow_decopt_12') ?></label><!--
+		--><span class="box" tabindex=0 role=checkbox></span>
+		<input type="hidden" id="allow_decopt_12" name="allow_decopt_12" value="%allow_decopt_12%">
+	</div>
+
 	<div class="Row buttons">
 		<a class="button icn-ok" href="#" onclick="qs('#form-expert').submit()"><?= tr('apply') ?></a>
 	</div>