I don't know how to merge files, but for the second part of your question:
Ki Recovery determines how fast (compared to it without being transformed) does your ki recharge from combat actions other than ki charge skills. Meaning if you set it to -1, your ki will recover -100% more effectively than compared to your base form recovery effectivness, meaning it won't recover at all.
As per passive ki drain - I plan to publish a list I made of all effects I found so far that a transformation can have, but for your needs:
- In PUP tab go to U_08 and/or U_0C
- Write in either or both (if both, the effect will be active twice, meaning it will drain your ki twice as fast; both are values for a special effect from a transformation and you can have the same effect active multiple times) 225 (SSGSS Ki drain) or 227 (SSGSSE Ki drain)
Be aware though that ALL effects carry over to the next transformation stage UNLESS you detransform first. You can do this by copying the detransform part of .bac into the next transformation stage. This has some issues though and you'll be better off creating a brand new animation dedicated to detransforming before transforming to the next stage.