PABacktester custom modification

Watch short 1min video to see how indi works

https://www.youtube.com/watch?v=QJVrJuWLWFo

Back-tester indi is attached

Simple mods I would like with PABacktester (PAB)

1.hotkey to initiate PAB a pre-determined number of candles back from the current price. eg)press a key and have the backtester start from 20 candles back, press another key and have it start from 40 candles back, yet another one starts from 100 candles back, etc,etc.
The candle back settings and associated hotkey could be configured in user inputs thereby allowing easy customization.

2.Hotkey for skip button(Spacebar) & hotkey for play/pause

3.A new button on panel and hotkey to hide back 1 bar (opposite function of skip button).

4.Also another mod that puts the PAB in loop mode for a certain candle number back (repeating itself) until taken out of loop mode.

I also cant get the PAB to start on the date requested. Some help with that would definitely be appreciated.