I made the Californium so expensive in U-235 because, to be honest, in the late game U-235 is so cheap its ridiculous, when you have the enrichment, it is never the limiting factor to anything. I also didn't want the nuclear rounds to be too cheap, as they compete more directly with base-game weapons, where the larger weapons are more of their own thing. They are sort of intended to only be usable when you get super late game, when you only really fight on your own (instead of using artillery) for fun.
I will re-name Californium to Californium-251. That is a good idea.
The high stack size of the cannon shells is unintentional... I'll change that too.
Lowering the flare intensity isn't possible currently - you can turn it off entirely, but not reduce it. I don't mind that the screen goes basically white when you detonate too many nukes, it seems like a realistic consequence (I mean you really shouldn't look at a nuke from like 20m away, even a small one)...
Thinking about it, I have quite a big screen, so might suffer less than others - I might add an option for the magazines if its a problem due to that kind of thing.
For the smoke effects, they are sort of meant to make it difficult to see, as it probably would be... unless you have something really remarkable, I probably won't be changing that - sorry (although I find them annoying sometimes as well).
I was leaving the range_modifier the same anyway, so that's fine.
You aren't being annoying at all!! Quite the opposite, I really like getting feedback on this stuff - it gives me another perspective on the mod, and other views on what is important, which is really helpful. Also other people play the game differently to me, so notice things I miss - like the stack size thing, as I don't use tanks that much.
The update including all of this will be out in a few days, after the fallout from the last update settles down, feel free to give me any other suggestions, I'd be happy to have a look!