There is no Custom ID Option in Visual Composer by default. Very likely Composer was additionally customized by theme authors to add such setting. We took into account your suggestion and will try to implement such feature in one of our next update, because this is very useful feature!
Visual Composer is external plugin which is included into theme because for each product we purchase “Extended license” and that`s why we are able to include it into them. We update Visual Composer plugin with theme updates time to time so with each next theme update, plugin will be also updated. You can always get current plugin version if you want directly from us.
The option with registering Visual Composer has been already added to plugin and this only allow you to get automatic updates and support for this plugin directly from author if you need. You don`t need to register this product because it is not required but if you want to get those features, then you need to purchase this plugin directly from author. This is how it works for all themes on Themeforest and not only in our case.
