In discussing weapon speed with @Lanefan in another thread, after looking it up I realized that was actually an optional rule in AD&D 2nd edition. As things like this tend to happen, my group used the rule right from the beginning so I completely forgot it was even optional after years of not playing 2e. While looking it up, I found it interesting just how many rules were optional. There were a ton of optional rules listed in just the core PHB and DMG books! And that’s without getting into all the additional books that came out later in the edition’s lifespan ("The Complete _____ Handbook" series or the Player’s Options series). So which ones did or does your group use? Here’s some examples taken from the PHB/DMG table of contents:
PHB Optional rules

PHB Optional rules
- Initial stat generation options
- Weapon Proficiencies
- Nonweapon Proficiencies
- Encumbrance
- Spell Components
- Weapon Type vs. Armor modifiers
- Group initiative
- Individual initiative
- Weapon Speed and Initiative
- Parrying
- Jogging and Running movement
- Racial level restriction slow advancement
- Racial level restriction exceeding level limits
- Armors made of unusual metals
- Individual experience awards
- Training to level
- Critical hits
- Specific injuries
- Character death: Hovering on death’s door
