EDIT: Nuclear Reactor overhaul may be coming though, so mechanics may change heavily.
No to the windmill, because multiblocks are laggy if not coded properly and greengens are overly spammable. There is an addon called CompactWindmills already. Spamming multi-windmills is little better than spamming solars.
Custom water: What will its actual use be?
No to Electrolyzed Water cooling, for reviving a deleted feature. Its also illogical because it will charge the nuclear elements in the reactor which will cause problems.
No to "Steam Coolers", because (pseudo-)CASUCs will be denied for a very long time.
What is the logic of putting halogens in reinforced stuff?
And what is the use of Reinforced Rod Holders? You haven't explained clearly.
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I know it can be laggy, but i don't write about things like 'this is order in which it must be'. It's just suggestions, for some kind of expanding part of IC2 which stagnate and/or aren't so much, or totally not re-created... Still, but it can be.
But i think if here are coders that can make things like Reactor settings and functions, it couldn't be so hard to make it if you know, what you do. And even if you dont know, here are lot of people and coders who can help with it. It's just about speak them. Soaryn, Eloraam, CovertJaguar, Azanor, SirSengir,... They all have abilities to help with it, and what else, most of this mods are O.S. which can make help easier. And again, its just suggestions.
I dont kno why your answer sound me so attackly, like if you are 'i know everything in universe'... But, jsut feel
Water: I wrote it, and i think really clearly and understandable. No generating in world, but, if itll be, probably sometime if Uranium Ore is touching water. I'll re-write my post for better understanding that. Sorry if you don't know what i actually mean.
Halogens? Because Iodid Rods are normally used for reflecting and consuming overflow radioactivity. Using them can protect player, because, ITS NOT POSSIBLE to go close to reactor if it run and be able to live long time. Radioation and things surround Nuclear Reactor have pretty BIG ability to expanding, discovering etc. But, as i said, i re-wrote it. Maybe it'll help.