We have Microsoft, Toshiba and Widcomm Bluetooth stacks. NOT ALL ARE EQUAL HERE.

http://forum.xda-developers.com/showthread.php?t=665422

You may find one can auto accept and another will not. This is not an offer to answer a question like how to change stacks. I will not respond to that but I KNOW this one. It's annoying that behavior/choices are not the same across machines and Bluetooth STACKS.
Bob