Subsonic 2.2 Paging Linked Table Collection

I'm creating a small forum for my CMS and I'm using subsonic 2.2 as my DAL.
I'm loading my theads like this:

DAL.ForumThread item = DAL.ForumThread.FetchByID(id);

In my database my ForumPosts table looks like this:

ForumPostID | ThreadID | Description | UserID | CreatedOn| etc

So now when I have my DAL.ForumThread item I can load the connected post collection by using:

item.ForumPosts();

This all works great, but the problem is that I'm using serverside paging and want to add some additional select parameters too like showing only active records.

Is this even possible when using SubSonic 2.2 ? The workaround I have now is just creating a new SubSonic.Query and select the posts by threadid and there I can set pageindex and pagesize without problems but I think this can be done easier?

I also would like to know if it makes any difference performance wise by just using item.ForumPosts() or starting a new query, I think the forumposts are already in the ForumThreads collection and don't require a new database call right?