Got a few thoughts on the various things they mention:
Countdown Timers
The spirit of it is fair enough - I don't think slow over rates etc are as big a problem as the media has sometimes made out recently, but equally when I was at the matches in the West Indies, it was a bit frustrating on the few occassions when they were just faffing around. Hard and fast limits at the end of overs, fall of wickets etc is not the way to do it imo. I don't think i would be fair to penalise a fielding side that had been good all day with regard to getting ready quickly, then slip a couple of times towards the end of the day and get hit with a penalty when it's not really an issue. The current system of basically saying get the overs in during the day needs tweaks with regard to enforcement and penalties, but is basically the right structure. Also, say at the fall of a wicket, the fielding side overruns because the batsman takes a little while to appear and when they do, it's not who they expected it to be, so they want to set a different field?
The DRS point is fair enough as you do occasionally get the scenarios like the one they mention. Just as long as there's no pressure, direct or implied, on the third umpire to compromise the process whatsoever in the interests of time.
Free hits
One of those things where the test purist in me is immediately riled, but on further reflection I conclude that it wouldn't really be a bad thing. That's not to say I think it would be a good thing either, it would just be different. Not sure how much excitement it would add tbh, I guess it would vary from person to person, but one of the most memorable moments from my trip was in the 3rd test when Stokes was dismissed off a no-ball, only to be recalled having taken his kit off in the dressing room. The reaction from the crowd was fantastic, as loud as when wickets were falling (and Bairstow getting a standing ovation for his 'innings' - he'd walked halfway out to the middle then had to come back - was pretty funny) and I don't think having the promise of a free hit would have added to it, but maybe it would. It shouldn't be massively common anyway, so no strong feelings either way - though I'd be inclined just to leave things as they are.
Although actually, thinking about it, if the no-ball in Flintoff's over to Ponting at Edgbaston 05 had meant Ponting got a free hit on the 7th ball instead of nicking off, how rubbish would that have been? Stupid change, don't do it.
Dukes ball as standard
Yeah, fair enough