Flash/HTML5 elements block

[rey]

please add same 3 variant switch for Flash/HTML5 elements, like there are already for scripts, images etc.
- show Flash/HTML5 (default, flash is shown and video autoplay)
- block Flash/HTML5 (all these elements aren't even loaded. useful for various purposes)
- ask Flash/HTML5 (elements are blocked till user clicks on them -only then they are loaded or video stars to play)