According to Mike from Tactrix:
That's a cool project. Yes, you could definitely use our EcuFlash software for the editor. The calibration data would have to be at fixed addresses so that you can make a definition file to map the tables to data types/sizes. I'm guessing you already have EcuFlash installed. In which case if you aren't already familiar with our definition files, take a look here for an understanding:
C:\Program Files (x86)\OpenECU\EcuFlash1444833\rommetadata\subaru\Impreza WRX
The only thing we'd need to do is to add a lookup to our code which would look in a particular spot in the ROM file to see if it matches one of our supported ECUs. That would be something like looking for value ABC at address 123 so that we know it's a Speeduino ROM. I can get more specific details from the owner here if you want to move forward.