The current key assignment quite good for the game right now.
However I hope the game option would soon feature a key binding screen.
At least give us a screen to check all the key bindings that is available.
In a recent game play, I accidentally discovered that Shift+1,2,3,4 controls the game speed. NO need to keep pressing slow/fast arrow on screen.
Hope the game development hasn't progressed too far to bring key binding change menu.
I know a game where the Devs forgot to include this and weren't able to do so later(EU4, anyone?)