There is no official way to do so. This was built to mirror the Featured Images functionality, and each page can only have one Featured Image.
Theoretically you could built a front-end display that only took the first x number of images in the featured gallery. How many do you want on each page?
I understand. 2 currently, but they are two different information and can be bad for the editor. I have a CTP with a gallery of the structure and the other would be for pictures gallery of services. Anyway, I can create a CTP called galleries and add a category to view the first CTP with query_post.
You could use regular galleries. They are created with the full media manager, and a shortcode is placed in the post.
Its a solution too. But theres a way to remove tinymce buttons? The CTP don’t needs any text and I want avoid problems with html tags. Theres a way to get only the shortcode?
The best way might be to just add some custom CSS to hide the editor and the TinyMCE row of buttons, in that case.