Creating Default Galleries
Using Jamroom
Followed along with your instructions and got the galleries working as I think you expect them to work.
Not sure where the trouble lies at.
Use the Form Designer to change the 'text' field of the gallery_title to SELECT make it 'active' and 'required'
When a user goes to upload a gallery they will have to select from the options you have given them.
Make sure the UPDATE form of the Form Designer matches so they have to choose there too. Also the 'detail' page so they cant create a new gallery from there either.
Should be good to go from there. When creating a gallery they HAVE to choose from the options. All images go into that gallery on their profile. You can then use {jrCore_list} to pull just those gallery images from all profiles to create a page for each set.