the amount of f/x can be adjusted.
Right, if I ever make a "dusty version" of my edit, I'll try to not put too much of these "big noise white shapes", because they are too caracteristic, they kind of screams "I'm a filter!". But without them and with not too much vertical lines (and maybe with a little photo grain added to the picture) it could works well on a full lenght movie without being boring or irritating.
As for the 4:3 resolution, I did not think about that; I guess it deserves a try, but I don't know... (not to say I would have to redo all my texts cards! NooOOoo, please don't let this appends!)