This has been discussed to death...Do a search. It's part of the emissions system and the short of it is NO it can't be changed...learn to deal with it, everybody else has.

 

Tis normal. No way around it (that i know of)

 

This probably won't help but I thought I would throw it out.

I had a 2004 Mustang with what was called the "rpm's hang issue." It sounds like the same problem you are having. There is something called an idle air control valve that caused this on the mustang. A simple restrictor plate that took five minutes to bolt on got rid of the problem. I know this is Ford and not Toyota but maybe they use the same technique for emissions and it can be overridden in the same manner.

Here is info on the Ford product FWIW.

http://www.mach1registry.org/forums/showthread.php?t=18330

Greg

 

You can read all about this issue in this thread:

http://www.toyotanation.com/forum/showthread.php?t=189780&highlight=lemon

And you can read about a guy in Florida that won a case against Toyota regarding this issue.
http://www.toyota-lemon.com/story.html

 

Could it also be related to the drive-by-wire system on all new cars? I'm sure everyone here has noticed the lag that is present when the depress the accelerator and the throttle actually opening up.