It would be nice to have a few extra lines in the configs to allow for different types of armor from different mods to be able to resist certain effects, such as having helmets from other mods, like the Nanosuit/Quantumsuit helmets from IndustrialCraft 2, be able to prevent the player from getting black lung or mesothemiola. Ideally, It'd be great to have a few customisable lines that allow the user to control which armor/armor sets could resist different effects.
Alternatively, it could be good to have baubles integration with the gas masks to enable the player to wear a full set of armour whilst still having the gas mask on.

My friend keeps whining about not being able to have a gas mask and night vision goggles on at the same time. Please help.

.... How exactly do they expect to fit nvg goggles over a gasmask lol?

Seconding this but for blocks. Biomes O' Plenty grass and dirt variants aren't affected by things like radiation natively.