Thanks Dave,
that helps 50%.
It still remains some parameters that are not listed on apm->acs-subsite->parameters such as tabbed layout options
anyway, finding my way out... ;)
i found an API to do the job
# Set paramters
callback subsite::parameter_changed -package_id $subsite_id -parameter "UserNavbarTabsList" -value ""
callback subsite::parameter_changed -package_id $subsite_id -parameter "IndexRedirectUrl" -value "main"
So, every time i call site_node::instantiate_and_mount
i write those lines later in the code.