AJAX wordpress theme tweaks (infinite scroll,filtering & post opening) - repost

Hi, I need to tweak the following wordpress theme: [login to view URL] This theme works with AJAX (Isotope Masonry Grid) and I need these 3 changes: 1) INFINITE SCROLL: as you can see for user to load more posts he has to click on the LOAD MORE button, I want to change that so user can use an Infinite Scroll ([login to view URL]) which I think is well documented on that page. In these themes options I can choose X posts for user to see or ALL posts, if ALL POSTS is selected the LOAD MORE BUTTON won't appear, if I choose X number of posts it appears. 2) FILTERING: the theme works with costum post types and costum categories, you can see the categories filtering on the top left. All OK, if you click on Illustration it will show 2 posts, but there are more posts inside such category, if you click LOAD MORE and click Illustration again more than 2 posts will appear. What I need is by clicking on any filtering category, the script fills in the page automatically with all available posts to the maximum (should consider infinite scroll settings) 3) POST OPENING: posts are opened in the same page via ajax (left only on my script), but if a user scrolls to the bottom of the page and he clicks on a post the post will open, but if he closes he doesn't get down, he stays up, for him to keep tracking the same post where he was he needs to scroll down again. What you could do is make the CLOSE button to force him to where he clicked, where simply open the post right next to him instead of scrolling to top. This is an urgent project, private FTP access will be given so you can work on my own project and can track your developments.