[Victor D]

As far as I understand you need to change section

<title>{strip}
{capture name=title}
{if $config.SEO.page_title_format eq "A"}
{section name=position loop=$location}
{if not %position.first%}&nbsp;::&nbsp;{/if}
{$location[position].0|strip_tags|escape}
{/section}
{else}
{section name=position loop=$location step=-1}
{if not %position.first%}&nbsp;::&nbsp;{/if}
{$location[position].0|strip_tags|escape}
{/section}
{/if}
{/capture}
{if $config.SEO.page_title_limit <= 0}
{$smarty.capture.title}
{else}
{$smarty.capture.title|replace:"&nbsp;":" "|truncate:$config.SEO.page_title_limit|replace:" ":"&nbsp;"}
{/if}
{/strip}</title>

in skin1/customer/home.tpl to

<title>{strip}
{capture name=title}
{if $config.SEO.page_title_format eq "A"}
{section name=position loop=$location}
{if not %position.first%}&nbsp;::&nbsp;{/if}
{$location[position].0|strip_tags|escape}
{/section}
{else}
{section name=position loop=$location step=-1}
{if not $config.SEO.page_title_format eq "B"}{if not %position.first%}&nbsp;::&nbsp;{/if}
{$location[position].0|strip_tags|escape}
{elseif %position.first%}
{$location[position].0|strip_tags|escape}
{/if}
{/section}
{/if}
{/capture}
{if $config.SEO.page_title_limit <= 0}
{$smarty.capture.title}
{else}
{$smarty.capture.title|replace:"&nbsp;":" "|truncate:$config.SEO.page_title_limit|replace:" ":"&nbsp;"}
{/if}
{/strip}</title>

and execute MySQL query in Patch/UPGRADE section:

UPDATE xcart_config SET  variants='A:Shop name :: Category name :: Product name\r\nD:Product name :: Category name :: Shop name\r\nB:Current page' WHERE category="SEO" AND name="page_title_format"