A few suggestions to improve history a lot
1) Enable scrolling the cursor position with shift or control+mouse wheel to easily move the history cursor backwards and forwards when mouse pointer is above history - like scrolling already
2) Update the screen when you move the cursor (by dragging or mouse scrolling) so you see it update when scrolling so you do not have to let go let go of the cursor before you see the result
3) Add keyboard shortcuts for going forwards and backwards in history - to click with the mouse is a pain 🙂
4) Please move the "play" button back. Placed in the middle as now you hit it by accident all the time when using the next step and previous step buttons. Playing is something I think most users do very rarely. Get it out of the way. But if you solve 1-3 - it does not matter.
kind regards
Morten