I don't have much to say, but... some noteable dubious mechanics and why people use them.
1. Robbing merchants. Steal their gold, buy items, steal their gold yet again.
In truth, this is an alternative to making money through picking up every single item. The more runs you do, the more tiring looting gets. This is a shortcut.
2. Reloading as way to experience a specific story line.
Sometimes, your team may get together and discuss a story path in advance. If freakishly bad luck gets in the way, reloading may be acceptable.
3. Dishonorable combat
Against combatants who would do the same to you (like the gith patrol). Grease ruins (saves) the day.
4. Ambush tactics and barrelmancy
Preserving spells slots. Especially at lower levels (3-4), it's tempting to wipe out gnoll pack #1 through make shift fireball.
This keeps you in top form to fight the miniboss. Resting between these encounters is tedious. Additionally, point 3 applies. Gnolls will not go easy on you with their multiple attacks a turn!
Hard exploits are situations like cheesing a boss fight, because there's a spot the boss can't reach. Most of the favoured cheese in Bg3 exists to preserve time rather than make up for a lack of skill.
Amount of cheese is maybe best left to the DM/leaders discretion? For example, if you have a lot of newbies, you may decide to allow the occasional barrelmancy incident for fun. It sounds extremely difficult to make up hard rules for everyone.
A party of people with not much time could use case #1, hardcore roleplayers decide to ban it. Just a suggestion. How about a master list of cheese the DM discusses at start of the game?
I don't really understand what your rule covers as /written/
. There's not much better clarification one can do than a master list of cheese
