Cool idea, since it'd enable deeps square reactors and the normally-unattainable 400% neighbor bonus.

However, shift right click to copy and shift left click to paste settings doesn't appear to work on these, which makes it annoying to do a bunch of them

Also - the default behavior of requesting a max stack of fuel breaks existing smart reactor setups using inserters (like when adding this mod to an existing save, for example). Would be nice to have an option to set the defaults to NOT deliver fuel, until existing setups can be gracefully migrated.

I think this one needs more time to bake, but appreciate the attempt!

In theory all "grouped" reactors should sync their configuration, so you wouldn't need to copy/paste. If that's not happening, it's a bug, and I'll have to look into it. Can you confirm it, please?
As for the default behavior, I agree, I'll change it to not request by default.
I don't really understand what you meant by "breaks existing setups". Could you explain a little more, please?

I think I get what you meant by copy and paste not working. You mean for different groups. Agreed, and I'm working on it. It should also work for blueprints while I'm on it.

What do you mean by "grouped" - like ones that are connected? Wow, i didn't even think to check that, but I will.

OK just tested - yeah the whole group of connected reactors inherits the settings of the one I set up. This isn't super intuitive, but it works!

Bigger issue is that the settings aren't blueprintable or copy-pastable so you have to re-do it manually for each reactor cluster.

Suggestion, feel free to disregard: what if you just made them behave like regular requester chests, so it'd still require the player to wire up a single combinator for the entire group (and connect the group via wire) but then you wouldn't need any new UI at all. It would still let you make NxN square of reactors

Sorry, I meant that I was working on making it work for blueprints. My message was confusing.
The copy/paste is working now on my local test environment, the update is not live yet. There are a few tests I want to make before pushing this new version live.
The point was not only to make the reactors behave like requester chests but also to make it easier for players to configure their logic of when the reactor should request. Making it still require the decider combinator would defeat the purpose of the mod. I agree that it is still barebones, but with time I'm hoping it'll become easier and easier to use.