Wow guys, I'm a bit surpised you would wish a Toyota drive-by-wire assembly on Jimi, I always though people around here liked the guy.
Anyway, Jimi, did you order the engine as Turnkey's basic package, or sans wiring and everything else they typically throw in with the package? I know they generally use a cable throttle body with their engines, which are setup with with Delphi ECMs, so if you're getting everything from Turnkey, then it might be easiest to go the cable route, although since they use Delphi ECMs the choice is probably yours.
I just spent last week really learning to drive with Corvettes out at Bondurant and was quite happy with the drive-by-wire gas pedal, then again I'm pretty use to those types of pedals as I have one in my Mustang. In my opinion they definitely have a different feel than cables.
Matt