Would it be possible to add the ability to add lightning rods to certain setups for automatic use on Fulgora?

I'm not entirely sure how it would work. The lightning rod/collector placement is kind of organic with the area merging and I think you need at most 4 lightning rods/attractors in the corners to cover everything.
If you still need them, you could try setting up a blueprint with them to use in the Blueprint Layout.

I figure in some of the more sparse layouts, or even the compact layout which I tend to use, it could be an option even if you overfill with them.