"there's still no capable and stable video editor for Linux."
Blender _constantly_ gets passed over when talking about video editors. Blender's internal video editor is very capable. The Elephants Dream, Big Buck Bunny and Sintel open short films were all, as far as I'm aware, edited and composited _entirely_ in Blender.
It may not be for grandmas editing together videos of the grandchildren, but it's not terribly difficult to use.