I would also suggest replacing the fusion generator with a MK3 burner generator uranium fuel celled power reactor, which is more credible (fusion generators are currently a little bit based on handwavium technology (e.g. we have backpack sized fusion reactors but no full scale reactor - burner and uranium fuel cell based generators are far more believable))
I would allow all fuel types - mid game with basic modular could use coal/solid fuel and late-game transition to rocket fuel or the Mk3 nuclear reactor
As long as bots are able to top up your fuel it would add no micromanagement that might otherwise be a little annoying compared to slap-and-go fusion magic
p.s. I realise this suggestion is probably a regular one - this is adding to the chorus (per the sticky suggestion
![Wink ;-)](./images/smilies/icon_e_wink.gif)