Here are the Android permissions required by Smart Keyboard Pro:
This permission is needed to import the built-in User Dictionary of your phone into the one of Smart Keyboard. This only occurs the first time the keyboard is used.
Required to use the "Vibrator" option (haptic feedback).
Required to suggest your contact names, when "Contacts dictionary" option is on.
Used by "backup to SD card" and "CSV export" features.
Used by the built-in voice recognition (for Android >= 2.3).