Then for a true "timeless Renko", it seems there are three workarounds:
1) With bar(), use tick data instead of 1-minute bar data, and it'll solve 99.9% of the problem.
2) With bar(), draw an extra-long Renko bar when the price moves too far.
3) Using tick() or run(), make your own homebrew Renko bars. But these bars would not plot on the price chart. You can check it by printing OHLC etc to CSV.