How USEFUL are the exposure bracketing functions in FF DSLRs?

This information is difficult to find in camera specifications or reviews.  So I'm asking Sony A900 and A99 users for their observations.

I want to upgrade to a full frame DSLR which has FULL bracketing capability.  I'm happy with the bracketing in my Canon 7D - but am very unhappy with my NEX-5 almost useless bracketing.  I had hoped Sony would get it right with their NEX-7 firmware upgrade - but alas no!  I'm worried that the A99 may be no better for full functionality bracketing.

Here's what I would like to know:

1. Wide bracketing range, A900, A99?  (probably +/- 3EV, usually shown in spec sheets)

2. Can bracketing be performed with a fast button push? Without the need to hold it till done?

3. Can bracketing be initiated after a 2 second delay? -after stabilizing.  A900. A99?

4. Can bracketing be initiated by infrared remote control? A900. A99?

My 7D does all four. My NEX-5 does none.  The NEX-7 (V1.01) does number 1 only.  The Sony drive mode selections lockout these useful options. It seems to me that anyone into HDR photography would want all four.  Comments?     - John C.