One of issues with ShortURLs or SimplifiedURLs is that the URL tends to be transformed by some web programs due to the use of "+". You may find that some web sites have your URL transformed
m-news+article+storyid-123.html
becomes
m-news%20article%20storyid-123.html
If someone were to click on the transformed URL, she/he would end up the front page of your site. And most importantly, you could potentially have the notorious 302 redirect problem with search engines.
To fix the problem, you may want to add one line into loadpage.php file
$request = $_SERVER['REQUEST_URI'];
$request = str_replace("%20", "+", $request);
highlighted is the new line added.
The downside of the fix - it may create duplicate content problems.