Suggestion is to add a new link or icon, perhaps something generic like "More...", in the same area that when clicked brings up the AddThis pop-up like it does when viewing the permalink. If the AddThis option is disabled in the ACP then the new link/icon would be suppressed as well. The way it is now the additional services offered by AddThis are hidden from the user and it is not intuitive to click a post # to view additional "share" options when there are already "share this page" options shown on the screen. When click on the permalink there would be no changes to the current behavior.
To be clear, I'm not asking that all of the icons from the permalink pop-up be added to the bottom of the thread view page (because that would be way too cluttered) but just a single link or icon that activates the AddThis pop up box.