Markup: Use Classes instead of Ids

Since edit sections are usually placed on a page multiple times it is not standards compliant to use Ids in the HTML, I would like to request these be changed to Classes, and maybe a unique Id be added, so for example instead of:

<span id="edit-section">...</span>

It would be

<span class="edit-section" id="edit-section-1">...</span>

Adding the unique Ids as well as Classes may help some themers when building a theme and want to alter a specific section's styling.

Thank you
Aaron