change wp_scripts->do_footer_items for usability better script enqueueing

Currently, if I have to enqueue script, I have two cases:
1) enqueue it in init (in theme or in plugin) with wp_enqueue_script. that’s not a good solution to me ‘couse the script might be not needed in all pages. too much garbage in page.
2) insert script right where it’s needed – that’s not a very bad case ‘couse mixing html page markup with scripts is BAD.
a good place for scripts is header and footer.
a good solution is to allow a user to enqueue a script in any place before wp_scripts->do_footer_items.
as for now, wp_scripts->in_footer is calculated in header and user can’t enqueue scripts after wp_scripts->do_head_items.

please change wp_scripts->do_footer_items.
this will allow to enqueue scripts anywhere before wp_scripts->do_footer_items.

function do_footer_items() {
        $in_footer = array_diff($this->queue, $this->done);
        $this->all_deps($in_footer);
		if ( !empty($this->to_do) ) {
			foreach( $this->to_do as $key => $handle ) {
				if ( !in_array($handle, $this->done, true) && isset($this->registered[$handle]) ) {
					$this->do_item($handle);
					$this->done[] = $handle;
					unset( $this->in_footer[$key] );
				}
			}
		}
		return $this->done;
	}

there might be better way, but this works perfectly for me.