Really cool, I can see I need to dig into the documentation for some of the new stuff.
About filter-grid, it's marvellous and exactly the concept I had in mind, but there are two tweaks to polish it up. One, tiles disappear from the screen when using next/previous filter, rather than scroll off and get destroyed. Two, if video snaps are used then next/previous filter causes them all to restart which is pretty jarring.
The 2x2 movie screensaver is absolutely flawless now, nice work! (Yes, I should play games...)