$nbcol should be defined in config.php, so you don't need to edit the plugin

[danreeves]

the plugin needs to use the hook for getting the config, something like:

public function config_loaded(&$settings) {

        if (isset($settings['nbcol']))
            $this->nbcol = $settings['nbcol'];
    }

then you can set it in config.php with $config['nbcol'] = 2; and access it in the plugin with $this->nbcol.

[danreeves]

Fixed in commit 9247f31