(0)
You can find the bulk of the documentation here:
https://dev.thefrontside.net/crosscheck/wiki/Documentation
You might get some help out of the mailing list archives as well.
(1)
You can print to the console with crosscheck.print('your message here')
See: https://dev.thefrontside.net/crosscheck/wiki/CrosscheckJavascriptAPI
(2)
You're right, stack isn't implemented. Feel free to create a ticket on
Trac for this or any other bugs you might find. You can create an
account by following the register link under search box.
Good luck! Let us know if you have any other questions or issues.
Jason