I would like some feedback on a simple idea. Right now if I select an instrument I see all of its price action for the day or whatever.

I would like to use an indicator which covers all the price action for the session with a solid rectangle. I should be able to uncover price action with my arrow keys.

I feel like this is a good alternative to market replay for me at this point. Any ideas on how to achieve this?

ChocLab 

I would like some feedback on a simple idea. Right now if I select an instrument I see all of its price action for the day or whatever. I would like to use an indicator which covers all the price action for the session with a solid rectangle. I should be able to uncover price action with my arrow keys. I feel like this is a good alternative to market replay for me at this point. Any ideas on how to achieve this?

Surely page scrolling the chart to the left and then arrow key stepping from there achieves the same thing?

You can F5 with the chart at left as well if needed.