Feedback for $.ajax: support for dynamic data arguments (#2806)

Hi devs,
I'd like to ask you for feedback on this ticket:
http://dev.jquery.com/ticket/2806
I've already added some comments to clarify, but would like to hear
more opinions about the usefulness of this within core. Depending on
your feedback it may be scheduled for 1.2.4 (test and implementation
are rather trivial) or deferred to 1.3.
Thanks
Jörn