I noticed this plugin uses mootools 1.4.1, but the one in joomla2.5.1 is version 1.4.3.
I hope, one day, there will be solution for mootools-more.js, because that script is huge.
Google Ajax libraries doesn't provider Mootools 1.4.3 yet, it only provider 1.4.1 currently.
One of the big wins with a Google Ajax lib is improved caching. More and more sites are using Google Ajax lib, so a lot of users local browser usually have cached Mootools already, there is no need to download the libraries even if the user visit your site on the first time.