Holy hell. You are setting up a whole new catalogue of potential disputes with that. Now we're looking at how far back the video ref is allowed to rewind the tape, depending on if/when its cleared ?! And lino's giving up on offsides to let the video ref decide instead....sheeesh, I wouldn't fancy picking over the bones of that AFTER a match, let alone DURING one !
I don't think so. If we're only interested in whether or not a goal was correctly scored then we're only interested in the action leading up to it. This has to be from the time that the scoring side last received the ball, and what they did with it. The defensive clearance would be the delimiter.
As for the offsides I would think that would be a natural by-product of video refs (the alternative would be for the players flagged as offside to try to score and hope the ref would refer the decision). But again, I cannot see that as a bad thing. Every week we see offside decisions incorrectly given - in both directions. I do think it's time that these sort of marginal and often controvertial decisions are taken away from the linos. And remember, they would only be reviewed if a goal was scored and the ref thought there was doubt.