AJAX Wishlist for Wordpress Custom Post Type

Hi,

I'm after a Wishlist that would work similar to one found here
http://shift-4.com/

I'm currently using a plugin called WP Favorite Posts
http://wordpress.org/extend/plugins/wp-favorite-posts/

I've tweaked it so it works with a custom post types using 'alexsean' help found here : http://wordpress.org/support/topic/custom-post-type-24
it's pretty much working how i would like it to except a few things:

1. when the 'add to wishlist' button is clicked it. it currently changes to 'remove from wishlist' ( http://cl.ly/OTYQ ). we would like to change it to 'add another' so more of the same product can be added.

2. The wishlist page which currently looks like this: http://cl.ly/OSzR I would like it to function like this: http://cl.ly/OTvf

a) an added input for changing the number with buttons either side to change the figure too.
b) a form to send the current wishlist to an email address

if this functionality can be added to this plugin or even rewrite a whole new one if that's easier.
please let me know your costs.

thanks