It has been stated very often (even in this thread) that the conversion of 2:5 is not very good (i.e. you basicly get EASY access to massiv amounts of MJ without any knowledge of BC and its enignes). That is why the Transformers mod will not be included. (I know we could tweak it with the configs but honestly i do not want to. There are plenty of other options available right now: Forestry, GregTech, PetrolGen for example)
The 1:1 ratio isn't perfect either. But the machines take time to create the lava and process them. So that makes it a bit more balanced in the long run in my opinion
"Easy"? How does it make it easy? Just because you have the conversion in one block? The process of creating lava and using for EU generation can be set up rather easily. And if it is that there is only the one block, the pack already has an Electrical Engine in the game. Transformers just ads more and higher tiers. And since you bring it up, yes you can change the conversion rate in the config (even though 2:5 is perfectly reasonable) just like you can with GregTech, which most people do. And if the FTB team doesn't like the conversion rate they can change it in the config in the release, just like they do with GregTech. So I don't see why this mod shouldn't be added.