diff -r f507feede89a -r 09a1c134465b web/wp-includes/js/tinymce/plugins/paste/editor_plugin_src.js
--- a/web/wp-includes/js/tinymce/plugins/paste/editor_plugin_src.js	Wed Dec 19 12:35:13 2012 -0800
+++ b/web/wp-includes/js/tinymce/plugins/paste/editor_plugin_src.js	Wed Dec 19 17:46:52 2012 -0800
@@ -23,6 +23,7 @@
 			paste_convert_headers_to_strong : false,
 			paste_dialog_width : "450",
 			paste_dialog_height : "400",
+			paste_max_consecutive_linebreaks: 2,
 			paste_text_use_dialog : false,
 			paste_text_sticky : false,
 			paste_text_sticky_default : false,
@@ -359,7 +360,7 @@
 			}
 
 			// IE9 adds BRs before/after block elements when contents is pasted from word or for example another browser
-			if (tinymce.isIE && document.documentMode >= 9) {
+			if (tinymce.isIE && document.documentMode >= 9 && /<(h[1-6r]|p|div|address|pre|form|table|tbody|thead|tfoot|th|tr|td|li|ol|ul|caption|blockquote|center|dl|dt|dd|dir|fieldset)/.test(o.content)) {
 				// IE9 adds BRs before/after block elements when contents is pasted from word or for example another browser
 				process([[/(?:<br>&nbsp;[\s\r\n]+|<br>)*(<\/?(h[1-6r]|p|div|address|pre|form|table|tbody|thead|tfoot|th|tr|td|li|ol|ul|caption|blockquote|center|dl|dt|dd|dir|fieldset)[^>]*>)(?:<br>&nbsp;[\s\r\n]+|<br>)*/g, '$1']]);
 
@@ -790,10 +791,23 @@
 					[/<\/t[dh]>\s*<t[dh][^>]*>/gi, "\t"],		// Table cells get tabs betweem them
 					/<[a-z!\/?][^>]*>/gi,						// Delete all remaining tags
 					[/&nbsp;/gi, " "],							// Convert non-break spaces to regular spaces (remember, *plain text*)
-					[/(?:(?!\n)\s)*(\n+)(?:(?!\n)\s)*/gi, "$1"],// Cool little RegExp deletes whitespace around linebreak chars.
-					[/\n{3,}/g, "\n\n"]							// Max. 2 consecutive linebreaks
+					[/(?:(?!\n)\s)*(\n+)(?:(?!\n)\s)*/gi, "$1"] // Cool little RegExp deletes whitespace around linebreak chars.
 				]);
 
+				var maxLinebreaks = Number(getParam(ed, "paste_max_consecutive_linebreaks"));
+				if (maxLinebreaks > -1) {
+					var maxLinebreaksRegex = new RegExp("\n{" + (maxLinebreaks + 1) + ",}", "g");
+					var linebreakReplacement = "";
+
+					while (linebreakReplacement.length < maxLinebreaks) {
+						linebreakReplacement += "\n";
+					}
+
+					process([
+						[maxLinebreaksRegex, linebreakReplacement] // Limit max consecutive linebreaks
+					]);
+				}
+
 				content = ed.dom.decode(tinymce.html.Entities.encodeRaw(content));
 
 				// Perform default or custom replacements