What's your goal? To have a collection of links but to only to allow link to pages of a perticular page type? Or do you really want to have a collection of pages of a given page type?
We are working on improvements on the list of content of a given type for the next release so if possible, check if you can delay this since I think that you might spend some work of solving this for the current version.
Thanks for your response.
My goal is to create a Image Carousel list block, that contains a LinkItemCollection property. This property allows user to choose number of imagepage type and use this block to render the image carousel.
What I prefer to have is when user open the UI, they can only see the image pages, not others.
I am looking for a solution which allows me to only display the specific page type pages in LinkItemCollection UI. I know there is a solution to limit the page type, but it's not that convenient for content editor.