I know the windows default messaging client can be enabled but haven't tried to change the email client. I am using a 6.5.x rom and it has the regular email client and I thought the stock rom had the traditional email as well, only texting was changed.

The letter recognizer option for text input I do not believe is available on the HD2 but you do have the traditional full qwerty and swype, both are very responsive and very accurate once you get used to the capacitive screen.

FM radio is available on the HD2 just like the TP2. I believe it is in the multimedia folder in the start menu but could be mistaken. Still requires a corded headset to be plugged in for it to function.