Thanks for bringing this thread to my attention.Sorry, no. This is not currently supported by s2Member or s2Member Pro, not as of version 110710 anyway. We do have plans to add this feature in a future release, but until then, you will need to add custom code of your own into the source code for s2Member, or using a Hook/Filter provided by s2Member, or possibly with the use of another plugin that can work together with s2Member.
At this time, I'm not aware of another plugin that provides a feature that integrates specifically with s2Member in the way you're describing. However, WordPress itself does provide this Template Tag in support of Gravatars:
http://codex.wordpress.org/Function_Ref ... get_avatarReference site:
http://en.gravatar.com/