What are Android keyboard shortcuts for Gmail?

Here is a list of Android keyboard shortcuts for Gmail.

Single keys:

A: Reply-all to current message (works when inside message)
Enter: Open email (from main inbox list)
F: Forward current message (works when inside message)
R: Reply to current message (works when inside message)
Y: Archive message (works when inside message or main inbox list)

Combo keys:

Alt + Trackball-Up: Jump to top of inbox
Alt + Trackball-Down: Jump to bottom of inbox
Menu + C: Compose new email
Menu + U: Refresh inbox