After watching CTWC (which is awesome) and starting to play tetris again myself I finally took the time to add wide screen support to LTris (my monitor gave me severe seizures in fullscreen...) by using a shadow surface. It is just software scaling but hey at least it is playable again in fullscreen.

As with Barrage: SDL will return bad mouse positions if switching window -> fullscreen. You'll need to switch and then restart the game. Nothing I can do about it, sorry.