I am not sure about the vibrating and ringing question, but will do my best to answer the rest.
I don't have the phone yet but after watching the review for the phone I can answer most of your questions.
You can substitute anything on the shortcut menu and arrange them in any order.
It does not have built in AOL/MSN messenger options, you can only send text messages.
No it does not have the predicitive typing either, I think that is just for cell phones with no keyboards.
Here is the review for any further questions,
pt.1
pt.2