I still dont know how to respond to that. The code is locked and is not available with the ruleset purchase.

You can write an extension and include a new record_char.xml and add your new tab there. If you put all your entries on the new tab you can do what you like. Changing core entries on the char sheet would probably require the whole code to be opened up, for example strength is referenced in 13 files.

Code:
<?xml version="1.0" encoding="iso-8859-1"?>

<root>
	<windowclass name="charsheet">
		<frame>charsheet</frame>
		<placement>
			<size width="515" height="610" />
		</placement>
		<sizelimits>
			<minimum width="515" height="610" />
			<maximum width="515" />
			<dynamic />
		</sizelimits>
		<minimize>minimized_npc</minimize>
		<tooltip field="name" />
		<nodelete />
		<softclose />
		<playercontrol />
		<script>
			function onInit()
				if User.isLocal() then
					speak.setVisible(false);
					portrait.setVisible(false);
					localportrait.setVisible(true);
				end
			end
		</script>
		<sheetdata>
			<button_charactivate name="speak">
				<bounds>-41,30,23,22</bounds>
			</button_charactivate>

			<token_char name="token">
				<bounds>-86,23,40,40</bounds>
			</token_char>

			<genericcontrol>
				<bounds>-137,21,45,45</bounds>
				<icon>charlist_base</icon>
				<disabled />
			</genericcontrol>
			<portrait_charlocal name="localportrait">
				<bounds>-137,21,45,45</bounds>
				<invisible />
			</portrait_charlocal>
			<portrait_char name="portrait">
				<bounds>-137,21,45,45</bounds>
			</portrait_char>

			<frame_char name="overviewframe">
				<bounds>10,20,365,45</bounds>
			</frame_char>
			<string_labeled name="name">
				<anchored to="overviewframe" position="insidetop" offset="-15,10" height="20" />
				<labelres>char_label_name</labelres>
			</string_labeled>

			<subwindow name="main">
				<bounds>0,65,-1,-10</bounds>
				<class>charsheet_main</class>
			</subwindow>
			<subwindow name="skills">
				<bounds>0,65,-1,-10</bounds>
				<class>charsheet_skills</class>
			</subwindow>
			<subwindow name="inventory">
				<bounds>0,65,-1,-10</bounds>
				<class>charsheet_inventory</class>
			</subwindow>
			<subwindow name="personal">
				<bounds>0,65,-1,-10</bounds>
				<class>charsheet_personal</class>
			</subwindow>
			<subwindow name="notes">
				<bounds>0,65,-1,-10</bounds>
				<class>charsheet_notes</class>
			</subwindow>

			<tabs_charsheet>
				<tab>
					<icon>tab_main</icon>
					<subwindow>main</subwindow>
				</tab>
				<tab>
					<icon>tab_skills</icon>
					<subwindow>skills</subwindow>
				</tab>
				<tab>
					<icon>tab_inventory</icon>
					<subwindow>inventory</subwindow>
				</tab>
				<tab>
					<icon>tab_personal</icon>
					<subwindow>personal</subwindow>
				</tab>
				<tab>
					<icon>tab_notes</icon>
					<subwindow>notes</subwindow>
				</tab>
				<activate>1</activate>
			</tabs_charsheet>

			<close_charsheet />
		</sheetdata>
	</windowclass>
</root>