I'm looking for a simple contact tab with captcha ? It seems there is not in CB Core O_o

You can use the email form, which is enabled within CB > Configuration > General. Then view the CB Menu of another users profile to send them an email. You'll need CB Captcha installed and configured for it to have Captcha. Alternatively you could use a PMS such as UddeIM.

And there is any solution for having a field in many tabs like using an alias field ?

Yup, create a delimiter field and render in the field of your choosing using substitutions (e.g. [cb_myfield]). More on substitution usage can be found in tutorials within my signature.

All the documentation available is in the Free and Advanced downloads section. Don't believe there's any specific emphasis on template development though. Fields however can't be templated and their output is hardcoded; well their HTML is anyway. You can still use CSS to style them.

Mmmh So there is no solution to code his own template ?

There's no extensive documentation covering this. You can of course supply your own templates. Please review our MyCommunity and Coolness templates as both supply CB templates. CBs template directory can be found below.

components/com_comprofiler/plugin/templates/