i2c full features

[btsimonh]

I'd like to use more comprehensive i2c support, e.g. commands to read and write registers. Use case is PCA9685 for control of servos.

Was there some reason why this is not a good addition?

(I've started coding it, but don't have much low level i2c experience, so it would be good to know if there are glaring gotchas..) br, Simon