Magma cream (due to its relation to fire resistance) is the analogue to 2,6 ditertiary-butyl-4-methyl-phenol, an anti-autoignition agent to help ensure safety in the event of a spill or crash.
And that is relevant exactly how? Except in an aesthetic sense? In the end, these are fantasy ingredients whose connection to real-world chemical compounds is nonexistent except in a thematic sense. As I see it, there is no reason to disallow tweaking it as long as the grinder is still needed. Also, you were ready to compromise in-world consistency to keep people from skipping tech tiers, why not forego the luxury - or rather, allow others to tweak things in order to forego it - of this element of cross-world consistency to make it a little easier to explore RotaryCraft? For, say, people like me who aren't afraid of complexity but are put off by certain kinds of resource-gathering, more so if it's in the Nether? Being somewhat realistic is all good, but I think it is not unreasonable to permit tweaking a recipe if it takes more time to set up the logistics for a mid-tier production facility for one fuel type than it takes to explore the rest of the tech tree.
Edit:
Here's what you need for a reliable supply of jet fuel ingredients if you want to stay with RoC as much as possible: a blaze spawner, a slime spawner, a boring machine in the nether, a boring machine in the overworld, the ability to fly (for the ghast tear), an ethanol production facility and repeated expeditions into the Nether to gather soul sand manually. Basically, I'd say without either Forestry and Gendustry or Magical Crops it's not worth the effort and if you're put off RotaryCraft completely by it that's perfectly understandable. You do want people who take an interest in RotaryCraft and are willing to learn the basics to continue to explore it, right?
I fail to see how soul sand is in any way difficult.
Getting any medium amount one time is easy. A continuous supply, however, is rather hard to achieve without Magical Crops. Soul sand patches are big but comparably rare, which means the chances are high your boring machines will never run into one.[DOUBLEPOST=1409298109][/DOUBLEPOST]
And Reika says people would go ballistic in the next post. Well, I'm not quite there, and I can live with the fact that the turbines need lubricant now even though I continue to resent the same change to the magnetostatic engines. The amount, however, is insane. I think there's something of a design flaw if the supply needed is virtually impossible to achieve within RotaryCraft/ReactorCraft alone.
BTW, @
Pyure, I will not forget that you voted yes on this.