SUGGESTION OF MODIFICATIONS
=> Disengage become a specific action for everyone and become a bonus action for specific classes (i.e cunning rogue level 2)
=> Jumping while engaged is not possible anymore
=> Jumping correctly reduce the movements (if you can jump more than move, you don't have movement left after you jump).
=> Hide is an action except for specific classes (i.e cunning rogue lvl 2)
=> Dipping is an action and only possible if you have specific and component in your inventory
=> Help became a bonus action for specific classes (i.e cunning rogue level 2)
1. Yes disengage should be a full action
2. No, it should be possible, BUT the engaged enemies get AOOs
3. Makes sense
4. Yes
5. Yes (also the mechanic is encroaching on certain Spell, so having at least components should be a restriction)
6. Yes
SUGGESTION OF NEW BONUS ACTIONS
=> Prone is a new bonus action available if you're engaged in melee
==> Dexterity check VS ennemy AC
==> Beautifull and immersive combat animation
===> Success : The ennemy fall on the ground for 1 turn. He loose his bonus action on the next turn to get back on his feet. While on the ground, everyone has a +2 bonus to attack roll.
===> Failure : You suffer -1 AC for the next attack against you
FYI this is something the shove Action does per 5e rules. Just separate them into Shove (away) and Shove (prone) as full actions and we're good. To quote the rules:
Using the Attack action, you can make a special melee attack to shove a creature, either to knock it prone or push it away from you. If you're able to make multiple attacks with the Attack action, this attack replaces one of them.
The target must be no more than one size larger than you and must be within your reach. Instead of making an attack roll, you make a Strength (Athletics) check contested by the target's Strength (Athletics) or Dexterity (Acrobatics) check (the target chooses the ability to use). If you win the contest, you either knock the target prone or push it 5 feet away from you.
Being prone is also a condition with a set of rules:
A prone creature's only movement option is to crawl, unless it stands up and thereby ends the condition.
The creature has disadvantage on attack rolls.
An attack roll against the creature has advantage if the attacker is within 5 feet of the creature. Otherwise, the attack roll has disadvantage.
Also you don't lose your bonus action to stand up again, you use half your speed that turn. Btw it would be great to become prone on purpose, as it makes you a harder target for ranged attackers.
=> "flip side with opponent" is a new bonus action - use your bonus action to move behind your opponenent (related to the backstab mechanic)
==> Dexterity check VS ennemy AC (proficiency bonuses for specific classes. I.E cunning rogue lvl 2)
==> Beautifull and immersive combat animation
===> Success : you are behind the opponent. You have the backstab bonus.
===> Failure : Malus to your next action.
I'd look to implement this for just a few (subclasses), if they lose something else that cannot be ported into the video game. There are already class skills that give you advantage for a cost (e.g. Barbarians recklessness)
Any comments on that ? Any other suggestion ?
I'll probably modify and/or edit the thread after we discussed about it because my goal is, as yours, to create the best possible BG3 experience
Keep in mind that I don't know every D&D mechanics.
No problem, thats why I gave you the the quotes from the rules. Your ideas are good I think, because you intuitively went where RAW 5e is already. A better implementation will do very much for this game.