Improved Display of Page Titles in Sitemap Mode

When in sitemap mode and a page block has a long title spanning more than one line, simply hovering over the title displays a tooltip showing the full title, which is convenient. If the title exceeds the block's visibility but remains on one line, hovering does not show the full tooltip, making it hard for people viewing the sitemap to understand the complete title. Is it possible to have the tooltip appear on hover as soon as a page title is not fully displayed?