ComputerCRaft as generic Peripherals which can be used to acess Capabiltiy Method from the Lua code. It would be awesome if such compatibility was added. (can be done with soft dependencies wuite easily)

I'm not sure what you have in mind exactly, could you clarify?

expose all capabilities to the computer craft api using generic capabilities, like FluidMethods or EnergyMethods. This way temperatur or "work" could be queried of all supported machines using computers.

I like that idea, but I'm afraid that this is not really in-scope for this mod (since it only targets adding new capabilities).
Perhaps you can open an issue within the CC issue tracker to request the feature there?