I'm asking this here as I feel that I've run out of ideas of what else can be added into an ATB system but I still think there are more such ideas. The below is a list of ideas I currently know:
Spoiler
1. Action Points - Some battlers can have more than 1 action points when their atb's full; Some skills cost more than 1 action points(some even give instead of cost their users action points); Some skills give or take action points from their targets
2. ATB Color - Some states can change their owners' atb bar color
3. ATB Gain - Different battlers can have different factors(mainly stats) dictating their atb gain rate
4. ATB Pause - The whole atb(turn and all battlers) stops running under certain conditions like animation running and/or actor/party/skill/ target window shown(These conditions can even be changed on the fly)
5. ATB Rate - Some states can increase or decrease their owners' atb gain rate
6. ATB Reset - Some skills can cause their users' atb bars to be reset as a set or variable percentage rather than the default 0%(i.e., empty atb bar)
7. ATB Start - Different battlers can have different factors(mainly stats) dictating their atb bar fill rate at the beginning of the battle
8. Cancel Button - Battlers can cancel their confirmed actions before they're actually executed(this mainly applies to skills that are still charging)
9. Clear ATB - Some states will reset their owners' atb to 0
10. Escape Condition - Party escape can have various conditions and can cost action points for party members(they may even have to charge before trying to escape and/or cooldown for each failed escape)
11. Ready SE - A unique SE sound will be played for each battler when that battler's atb becomes full; Another unique SE sound will be played whenever the turn count is increased
12. Skill Charge - Some skills needs to be charged for a while before they're actually executed
13. Skill Cooldown - Some skills causes their users(not just the skills themselves) to have to cooldown for a while after using them
14. Skill Hotkeys - Skills can be used via assigned hotkeys directly instead of navigating the actor command window followed by skill window
15. Turn Control - Turn length can be dictated by time, actions, or number of battlers
16. Turn Display - A window with a bar and a number will show how long the current turn has lasted versus the current turn length
17. Unison Skills - Some skills requires more than 1 battlers to use(all these battlers pay the same skill costs, make the same skill charge and cooldown)
2. ATB Color - Some states can change their owners' atb bar color
3. ATB Gain - Different battlers can have different factors(mainly stats) dictating their atb gain rate
4. ATB Pause - The whole atb(turn and all battlers) stops running under certain conditions like animation running and/or actor/party/skill/ target window shown(These conditions can even be changed on the fly)
5. ATB Rate - Some states can increase or decrease their owners' atb gain rate
6. ATB Reset - Some skills can cause their users' atb bars to be reset as a set or variable percentage rather than the default 0%(i.e., empty atb bar)
7. ATB Start - Different battlers can have different factors(mainly stats) dictating their atb bar fill rate at the beginning of the battle
8. Cancel Button - Battlers can cancel their confirmed actions before they're actually executed(this mainly applies to skills that are still charging)
9. Clear ATB - Some states will reset their owners' atb to 0
10. Escape Condition - Party escape can have various conditions and can cost action points for party members(they may even have to charge before trying to escape and/or cooldown for each failed escape)
11. Ready SE - A unique SE sound will be played for each battler when that battler's atb becomes full; Another unique SE sound will be played whenever the turn count is increased
12. Skill Charge - Some skills needs to be charged for a while before they're actually executed
13. Skill Cooldown - Some skills causes their users(not just the skills themselves) to have to cooldown for a while after using them
14. Skill Hotkeys - Skills can be used via assigned hotkeys directly instead of navigating the actor command window followed by skill window
15. Turn Control - Turn length can be dictated by time, actions, or number of battlers
16. Turn Display - A window with a bar and a number will show how long the current turn has lasted versus the current turn length
17. Unison Skills - Some skills requires more than 1 battlers to use(all these battlers pay the same skill costs, make the same skill charge and cooldown)