1. Show lines for all history, which lets you gauge trading strategies throughout time
2. More sensible Default/Auto time frame; e.g. on intradays only and always the market values of yesterday's Day are used
3. The halves between the key levels are also shown, which it's useful for some trading strategies
4. Arguably out-of-the-box nicer interface
as an indicator is a traditional strategy to draw resistance and support levels. It's best suited for intraday trading: the and resulting key levels are calculated from yesterday's market values (H, L, C). More details in the script's source.
trading is suitable for any market, and best for intraday (e.g. 3 min).
Let me know otherwise if I didn't understand you properly.
i sugges option to show only the last 2 persiods
ex. if i choose Time frame = 1h, the lines will only drawn at last 2 hours