If you want to remove bots from the game, you should definitely provide more features for belts, i.e.: an even faster belt than the blue one with according inserters and underground belts (maybe even another speed for very, very late game?). Also, another (faster/better..) version of the electric ...

I'd like to come round to your opinions with some additional suggestions:

* Losses when connecting wide areas. This could implicate different types of power (like in real life): active, reactive and complex power. Depending on what load you supply, ordinary lamps would consume active power, motors ...