Auto trim has been in the ACE Micropro transmitter for years, and is now avalable in kit form and assembled transmitters from jensen jet models in the form of the Microstar system.
Both of these radios have PC interface capability and a ton of programming features. In fact you program the thing with the sticks and a button, pretty easy.
http://mstar2k.com/ The designers web site
http://www.jensenjetmodels.com/id30.htm kits and assembled Transmitters