1) It would be a good idea to choose mobile template colors like you choose desktop template colors.
2) In pornstar, it would be a good idea to add a submenu, like in video with "recent, popular, rated...". Because for now it only list pornstars by most recent.
3) The tube standart nowadays is 3 thumbs per row when smartphone is in horizontal and 2 thumbs per row when smartphone is in vertical. You can see that on xvideos.com, txxx.com, sextvx.com and many more tubes. It would give better user experience than one thumb per row.
1. In 3.x the mobile part will be more complex, it will have the exact features of desktop but with separate template.
2. In 3.x already there.
3. I could implement this in 3.x (the main problem is that the script allows users to upload their own thumbs, if the thumb does not have the correct size it can break the design).