Maybe the others have better suggestions but I think you need to modify some IAC parameters that aren't defined in the EE xdf's that I've looked at. Unfortunately the disassemblies that I have looked at are not great so it's going to be a significant amount of work to add those parameters to the xdf.
In the $E6 xdf there are a ton of IAC settings. Specifically I think that "Added IAC Flow for P to D Shift", "Added IAC Flow for D to P Shift" (I'm guessing this one is actually mislabeled and it subtracts not adds), along with "Idle Proportional Term vs. RPM Error" (actually a bunch of tables depending on open/closed loop, drive/park, etc).
Steveo, do you have access to a better disassembly? I looked at the EEXTRA xdf which has a few more IAC parameters so I'm guessing more work has been done on the disassembly for that...
EDIT:
I see now that the IAC stuff is on the t-side and already somewhat commented, so maybe not as hard to figure out as I thought...
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