The MP Share Center allows you to easily add share buttons to your posts and pages.
Yes, you can. As of version 2.0, you can select to display only the social networks that you want to display.
Yes, as of version 3.1 you can change the font of the Call to Action. If you would like to suggest other font choices, contact Mike@MikesPickzWS.com
Unfortunately, the Pinterest button is different from the Bookmarklet. With the button, the image that is being pinned must be defined, as opposed to the bookmarklet which allows you to choose from any image on the page. For now, the only option is to grab the first image from the post. A future update, may contain the ability to allow you to select a specific image to pin from the post menu.
Unfortunately, you can not fix this. Google only supports IE 8+ with the Google Plus button.
You can find the post ID by looking at the Address bar when editing a post or page. You will see something like "wp-admin/post.php?post=128&action=edit". The post id in this case is "128"