Ability to merge files from two different devices?

[jayt]

It would be nice to have the ability to merge files from two devices. Currently I have a Garmin Edge 500 (distance, altitude, HR among others) and an iBike (distance, altitude & power among other items). I would like to merge the two files for a given event so the HR and power data is merged together. The online TrainingPeaks can do this, but it would be nice to do natively in your software. As an aside, I can not use the TrainingPeaks (TP) merged file as it uses a .pwr file format that your program can not read. Anyway, I'd just as soon do away with the TP subscription. I realize there can be limitations to merging, but it seems that a time based, or distance based interpolation should work.

PS In my particular case there is a hardware solution (once I take the iBike wireless it will merge the HR data), but that costs $$'s that I don't currently have.