Ok, search for the file wp-content/plugins/mudslideshow/mudslideshow.php
In lines 101 and 102 you would read this
Now add this line between them
This line would allow MudSlideShow to format the excerpt.
Now you can add a gallery to the post, and set a subset inside the excerpt. You can have a subset adding the first and last photo position to the tag, like this:
Use the entire gallery (without the limits) in the post content, and the subset in the excerpt.
In the next release I would add a setting in the configuration to allow the user to define if he wants to show just the first line when displaying a gallery in the homepage (or search page or tag page or category page). And I will add a new configuration number (the one that comes after the album source in the tags) to use the opposite behavior in a particular gallery.