A couple of minutes sin bin for various offences is a good idea.
I know it won't happen but a pro rata fine (let's say 20% of their net weekly wage) for dissent would do wonders, actually hurting players wallets has a far better likelihood of reducing bad behaviours than a yellow card.
De Paul should get a red card for that arm grab.
You can see why the ref gave the red, in motion it looks like he smashes him in the face but the replay shows it was actually a really restrained attempt to get the fucker locking his arm in place off him.