injured players is tough cause safety has to be paramount for the injured player so getting off the field not always easy.
i suppose in the instance you can't get yourself off the field, the game could be stopped, you get off and a free kick to the team that had the ball with a sub coming on while player is injured and he can't be off for more than 5 minutes otherwise its an automatic sub.
I think you need to stop the clock and have a countdown clock
stopping the clock ensures the ball is in play more of the actual game time and you can't chip away at time by taking the maximum allowable time
while at the same time, the countdown clock ensures you pick up.
admittedly mostly an issue for scrums and kicks versus lineouts.
but the game needs to speed up. yes nfl has lots of stops but when it is going it is all action. NRL largely the same.
i think a clock on scrums may de emphasize scrums a bit - not so they are irrelevant but to increase the focus on getting on with the game not and not setting up for the perfect power hit.
question is how do we keep the things that make us unique while also making the game more entertaining.
I think addressing the jackal / rucking, speeding up scrums, kicks and lineouts all go to doing that and if you couple that with saying "yes you can take he full 30 seconds to set up the scrum but you aren't milking the clock" then i think we're in a good spot. growing up, you are always on your feet in a ruck. I think once a ruck has formed, the jackal should have to let go of the ball. you want to win the ball in a ruck situation, get on your feet/get to the ruck fast and first and get the ball.