Render frame range

I often use the VSE with scene strips, and find it very convenient (although slow).

I often do test renders of a portion of a scene (a frame range), but I don't want to forget the scene start and end frames. I think the problem is the scene start and end frames are used both for rendering and to delimit the bounds of VSE scene strips.

I think it may be useful to add a "render range" feature, separate from the "scene range" and the "animation playback range".

Let me know what you think