1) Nuke offside review. But if it's not nuked, make it a plane like the goal line in NFL where if your skate is off the ice but on the plane, it's an onside play to limit the amount of goals that get called back.
2) Anything black and white like puck-over-glass delay-of-game, puck into the netting/out of play, hand pass etc. should be reviewable.
3) I'd like to see defensive players be allowed to be more physical in and around their nets to protect their goalies and clear players out. This might lead to less GI reviews.
Too dangerous. With the speed of the game now, if someone goes crashing in, they would get severely injured more easily. I agree something should be done but not at the expense of safety like that.
Maybe call more penalties for a goalie or defensive player 'accidentally' knocking the net off.