I need, Either 2 different mods, Or perhaps the Devs can make these alterations to the game directly)

Firstly, a mod that disables the Geneva convention mechanic, (What's banned at the start of the game remains banned and can't be changed or voted upon)
Cleanest implementation would simply add another checkbox for this option with the others checkboxes on the bottom left side in the game configuration screen

And then one other mod that, like, doubles or triples the potential duration available, for that optional "peacetime period" at the start of the game.
Cleanest implementation would simply adjust the max values, of those 2 sliders (peace time period/ no nukes period)

I think these changes would be relatively unoffensive and improve the game, all the better if the devs could do it