[pawel.kudzia]

ok. so i will answer myself, at least partially.

vision of using built-in editor upset me so i've looked into the code and figured out that [only for development time; not for production!] i can load templates from files. here is how:

#1 create sample page as described at https://vborg.vbsupport.ru/showthread.php?t=228112

#2 modify end of the php file

PHP Code:

$templater = vB_Template::create('TEST');
$templater->register_page_templates();
$templater->register('navbar', $navbar);
$templater->register('pagetitle', $pagetitle);
// here come the changes:
require_once('includes/adminfunctions_template.php');
$vbulletin->templatecache[$templater->get_template_name()] = compile_template(file_get_contents ( './myTemplate.html' ));
// and last line remains unchanged
print_output($templater->render()); 


#3 add template as usual in adminCP, but store it's content also in ./myTemplate.html . if you need to do quick update - just modify that file.

this seems to work fine for me.. under vB4b5 at least.