Marcos,
1) Share isn't an option yet, but something we'd like to add in the future. The Like button can be changed to "Recommend" easily by changing the "Verb to Display:" setting in the Social area of JFBConnect.
2) Pinterest in an option in the Social area. Just enable it if you want that button to show. Tumblr isn't an option, and likely won't be added in the next release. We are planning a new social sharing system for late this year, which should make adding more buttons and support for other extensions much simpler.
I hope that helps,
Alex