First off, the very long Integrated Electronics Guide that I finished up a bit ago.
Second, thanks for pinning a questions thread - makes it easier for me to help out.
Mobile posting so, post formatting will be meh.
Regarding Circuits being picked up - not sure what you mean? You can wrench down assemblies, which prevent them from being picked up without wrenching again.
If you want to actively punish people for picking up the assembly - maybe a locator, combined with a reagent injector or a grenade manipulator?
Regarding the Fuel Cell component - no. Still broken. I’ve made several issues detailing problems with various components. The long and short of the matter is - the IE module is an intricate and complicated (at first glance) from a coding perspective. It’s been about 5 or 6 months since any significant changes or fixes. Here’s a link to the Fuel Cell issue.
EDIT: When I get back to my place, going to run through code and game tests for every component, make an issue on the github for each, and make a suggestion thread linking all of them. One of the main problems is that when other modules were updated, the coder didn’t bother to update IE. For example, the Material Manager component has no idea what Plastic is.
Probably going to make feature suggestions as well in a different thread.