We should really change the way toxins work. There is pretty much no way to clear the pipes, which is quite important when you need to mix something else, or if it bugs and refuses to flow. You're also limited to only one bomb test, as you have no way to reconstruct the bomb range. It's also really annoying that you can't refill your canisters, unless you manage to convince the atmos techs to refill them for you.
I guess the first problem could be fixed by allowing the portable scrubber to scrub the pipes (I tried connecting the scrubber, but it pretty much acted like a normal canister). You could also change the piping slightly to allow it to pump into space by turning a manual valve, and maybe adding an extra pump so you can do it without wasting your precious plasma. This only applies to the heating chamber piping of course, but putting a manual valve and a pump on the mixing thingy and connecting it to the aforementioned vent should allow the entire system to be cleared by turning a few valves. In fact, you could skip a lot of the tedium by connecting the mixing pipes directly to the heating chamber instead of dragging them one at a time to that input thingy. Although that would require re-piping the whole system. It makes a lot more sense if you used the old map.
I'm not sure what to do with the bomb range part. I guess you could give the toxins guy a space suit and some metal. Or maybe make the range reconstruct itself somehow.
[wild dreaming] You could also turn it into a complicated system which measures the explosive power of the bomb and recreates it in an observable environment with holograms or something. [/wild dreaming].
The last problem is easily fixable by connecting toxins storage to the atmos tanks, and allowing the canisters in storage to be connected directly to the atmos tanks. Or, you know, giving us atmos tanks of our own.
Having a five-canister mixing thingy would be nice as well.