If you connect a hardware keyboard to your device, the following shortcuts are available. They are also accessible by pressing MENU + the letter.
CTRL + S - Save
CTRL + W - Save As
CTRL + P - Preferences/Settings
CTRL + R - Revert
CTRL + E - Encrypt/Unencrypt
CTRL + I - Import
CTRL + T - Theme
CTRL + P - Preferences/Settings
CTRL + C - Change Countdown Mode
CTRL + D - Pick Ringtone
CTRL + S - Set Automation
CTRL + P - Preferences/Settings
CTRL + S - Include/Exclude Media Scan
CTRL + F - New folder
CTRL + M - Multi-select
CTRL + L - Lock Category Index
CTRL + E - Edit Category Index
CTRL + A - Add Category Index
CTRL + E - Edit Item
CTRL + M - Mark Item
CTRL + S - Item Stores
CTRL + R - Remove Item
CTRL + C - Copy Item
CTRL + D - Delete Item
CTRL + L - Move Item
CTRL + N - New List
CTRL + C - Clean Up List
CTRL + P - Preferences
CTRL + R - Rename List
CTRL + T - Theme
CTRL + S - Send
CTRL + M - Mark all items