I'm making heavy use of service_links and love it, thanks!
It'd be really helpful to invoke an alter hook after collecting all the settings (especially node tags/substitution tokens) for a given node. In my case, my site has its own custom URL shortener, so I want to swap out the tokens related to URL shortening. However, you could also use this alter hook to do cool things like show/hide specific services on specific nodes or types of nodes, etc. I'm using this in 6.x-2.x, but I'm attaching patches for both that and 7.x-2.x (which is nearly identical except it adds an entry for hook_hook_info(), too).