Hi,

have question regarding sitetree menu on leftside in CMS. I want to put my own module like "newsletters" or "files&images". And I don't want that my pages types of my module appears in sitetree as page type. How can I separate my pages from sitetree?

All ideas are welcome!

I think I have an issue alongside this one.

I need to have each 'Photo' in a 'Gallery' be its own page within the Gallery. I've set this up so that these can be created and editted via a CTF within the appropriate Gallery. However, as a Photo can be in more than one Gallery, I want to hide the Photos within the SiteTree and only make them accessible and controlled via their ManyMany CTFs.

Is there a way to remove [this Page Type] from the Admin SiteTree?

So you want to have the left pane be a list of the Galleries available, being able to add or delete them in the site tree. Then on the main pane have a many_many CTF where you can add images and then add or remove them in the gallery?
You should have this as a separate admin area as they don't really have to be pages, creating the site tree on the left would involve creating a class which extends DataObject and then building the site tree. The issues you might have are allowing addition of images in the CTF. Might have to be a simpleimagefield as I don't think you can use and imagefield in the CTF. I'd be interested if there is a way.
You kinda want something like the Comments admin area?