That's an interesting idea. I'm not familiar with PyAnodon at all but I'm glad this mod is actually useful for proper bases instead of just the weird things I build. I'll have to look into that!
With this mod, I only really had the base game in mind where you can't create steam below 165 °C. I feel like it might be a little odd to have a recipe for cold/uninsulated steam barrels at 15 °C that isn't that useful in the base game.
So I'm not sure how to handle this request really - I'm torn between adding it or making a second mod that has it.
In testing, I've also had problems with accidentally mixing 165 °C steam with 500 °C and then not meeting the minimum temperature requirements for barrelling. Normally you just end up dumping all the steam in the system by deleting and replacing tanks, which is a pain.
It might actually be better to add a mod that solves these problems more generally - actually add a steam vent, or a recipe for chemical plants that consumes steam and produces nothing. You can specify a max temperatures in recipes too which could be useful, but I'm not sure if you can use that to raise the overall temperature of the steam.
It could work for other fluids too like heavy oil, but it should produce pollution or something.
Or maybe a chemical plant recipe that condenses steam at any temperature back to water could be useful too.
Actually come to think of it, I think steam engines and steam turbines can vent steam already, as long as there is demand for power. You can put in colder steam and they just produce power at reduced output. You could probably do something clever with circuit conditions to detect if the steam is too cold and enable a pump to vent into a steam engine/turbine. To ensure there is demand for power, you can put the steam engine/turbine on a separate power network with a bunch of radars (or anything else power hungry). Or do something even more clever involving accumulators.
There's also the coal liquefaction recipe in the oil refinery which consumes steam at any temperature.
Sorry for the ramble, but let me know what you think about any of that.