That is fine, but remember, the suits will not fully protect somebody from radioactivity. They do have a lead layer built in, which can prevent a lot of radiation from getting through, but it wont prevent all of it. Remember, they aren't totally invincible, its not like you can just wade through a sea of gunfire, so I don't think you need them to be modifed weaker/stronger. Also, remote shutdown can be supplies, but it wont totally turn the suits off. If it did, anybody inside at the time would simply be crushed to death. Instead it disables some of the sensors and all the weaponry systems. Could the suit be ordered without weapontry that wouldn't be used to aid mining?