I guess I'm inclined to say yes. My first experience with tuning was the GDE Hot Tune. I thought it was great, but still had some minor complaints about turbo lag, so decided for the trans tune, which further improved response. Unfortunately, I have not been able to restore my GDE trans tune since getting the AEM and looked to other vendors.
Since I had good experience with the ecu/tcm trans combo from GDE, I have opted to do both with other vendors (SFT and MRTuning) and can't really speak to their ECU tunes alone.
Both tunes are much better than stock. I felt that the SFT tunes resulted in a more aggressive driving experience (holding gears longer and generally louder because of this). The MRTuning tunes resulted in a more "normal" driving experience, in my opinion. Thus at the moment, I am using the MRTuning tunes because of my driving preference. The MRTuning trans tune has been the smoothest shifting tune I have tried.
So, I guess I haven't entirely answered your dead-pedal question.. because I can't. With the exception of GDE, I've installed the tunes simultaneously. But, there's no reason you couldn't get the ECU tune and try it and then decide for yourself if you want to try the trans tune.
I will say though that with every single tune I have tried, I still get a random time (like once in every 20 starts) where I push the accelerator and find myself waiting for the power to show up. I'm not sure what causes this phenomenon.