With each upgrade of WordPress, I edit manually "post-template.php" to change the behaviour of the #more anchor. So I might as well submit a request for an official change (however unlikely) :
1. Simplification of the #more anchor
Currently, the name of the #more anchor includes the post ID number (for example: #more-354). Yet, I cannot think of a situation where the post ID number would be necessary to avoid conflict. I suggest the following simplification :
replace id="more-' . $id . '" with id="more"
2. Correction of the #more anchor
From my experience, paragraphs cut prematurely by a #more link (typically in teasers on the main page) are missing a closing tag and lead to an invalid HTML document. I suggest the following correction :
insert if ( ! empty($more_link_text) ) $output .= '</p>';
3. Translation of the #more anchor
The #more anchor appears directly in the user's address bar. It is a visible and highly reoccurent element, but themes don't have control over its name. I suggest that a romanized translation of "#more" be possible (for example, "#suite" in French).