Some schemes use 0 hp crates(guess what schemes? roping schemes :D ) so it would be nice if you add "?" sign like there is in mine fuse setting. If mine can be 0(instant) why health crate wouldn't be able to be 0?

Good idea , as a scheme option

It should be opcional: a scheme setting! Good idea

Maybe have it so you can set both a minimum and a maximum when in "random" mode and you click the health icon it self (on the right of the adjustment bar) to switch between random or not?

Good idea for "fun" schemes (ex. crates hysteria, rubbersupersheeper, mole shopper).

its a bad idea i think, becoz of Roper scheme. but anyway, if random health, then random damage too pls^^ that scheme could be RoperExtraFun

I like the extra fun brought by gambling.

So you're suggesting that the random amount of health in a crate health be viewable or not? Or, say, only when using Crate Spy?

There is potentially more depth when thinking about whether to collect a health crate, if you don't know how much health it contains. There could be an element of strategy, if the amount inside were already known before collecting it, making a choice between two health crates left and right, for example.

What do you need this for?

Actually scrap that, just select the amount as usual, and add an option for health crates to randomly have between 1hp to [amount].