Hi 1999.fatih,
Thanks for reaching to us.
First of all, I’m really sorry have taken long time to reply you due to the weekend.
1, 2. Unfortunately, there is no such an option right now. You need to find a third party plugin to achieve more functionality that best suits you.
You can also create a ticket here: https://woodmart.canny.io/feature-requests so our developers will consider such a feature.
3. Unfortunately, sorry to say but right now there aren’t any options available which will allow you to add more than 2 Custom Tabs for Products specifically.
You might want to look for any third party Plugin in this regard, if you want this additional feature.
Regards,