...
You will be creating three hotkeys, using the three headings highlighted below.
1. Under the Image headerheading, scroll down until you find Image Rotation > Arbitrary. Set this to F1 and click Accept.
...
2. Under File, scroll down to Scripts > Browse. Set this to Alt+F1 and click Accept
[keyboard shortcuts alt+F1]
3. Under Layers, scroll down to Flatten Image and set to Alt+F2
[keyboard shortcuts alt+F2]