General Support: Problem with the page extensions

Plogger picture pages are using image file extensions !
That's working fine ;-)

But that's not a serach Engines friendly extension :-)

Why ?
Because search engines will not read the page content

Some search engines could not spider the integrity of our photo gallery !!!

So, to finish my SEO pack for Plogger 3 I have to keep the mod_rewrite functional and change only the PIcture URL

.../plogger/hotels/piscines/eldorador-aladin.jpg ===> .../plogger/hotels/piscines/eldorador-aladin/ or .../plogger/hotels/piscines/eldorador-aladin.html
Or it would be nice if it will be changed by it's caption

I've tried changing function generate_url on plog-functions.php
at the level of
else if ($level == "picture") {
I changed $rv = $config["baseurl"].$pic["path"]; by $rv = $config["baseurl"].$pic["caption"];

I was able to see that working in the navigation bar when I mouse Over a thumb linking to the picture page. But the link is certainly not functional !!!

And that's functional on not composed file names :
Example : /gallery/films/titanic ==> titnic.jpg
and it's not working on /gallery/films/City-of-angels !!! =/=> city-of-angels.jpg


Is there someone who can help me to change picture URL's