Yeah if anything I've often been annoyed in the past that not enough time is added on at the end of a game. The reason managers make subs right at the end of a game is partly to break up the flow of the game but also because they know that often the ref won't add on an extra 30 seconds for a substitution. I can't remember the games now but there were several last season where a team should have got about 5 or 6 minutes of injury time and only ended up with 3 or 4. Sure, that might ultimately make no difference but they could score in that additional time they should have had.