With a situation like Jimmy today I do find it incredibly frustrating that the rules don't allow you to say he's out of the game and bring in another bowler. I understand all the arguments against it but a fielder/bowler being injured early on day 1 being replaced doesn't harm the balance of the team/match in nay way and doesn't allow you to pick a dedicated bowler and then replace them with an all-rounder for some extra batting (for example). I'd change it that an injury during the first innings (for either team) can be replaced 'like-for-like' in the 2nd innings but the replacements need to be submitted ahead of time.