And a horde of golems can bring a server to it's knees
So can many things. Golems aren't that bad. They're just Entities that can do things that a player can do, right?
~I'm not sure if cinnabar is cross-compatible with tech mods that use it, so it might be useless.
Except for TE3, yeah, not sure it's useful. I mean, GT had some uses for some items from TC in the past, but that was a while ago, and it's GT.
But on the topic of TE3 and cinnabar, yes, you can convert TC4 Cinnabar into TE3 Cinnabar if you make sure to not smelt it. That Quicksilver stuff is all but useless outside of TC4.
And no, for the record, the fact that you can convert TC4 Cinnabar into TE3 Cinnabar isn't "Overpowered" in any way, since it's rarer then Redstone(spawns in very small amounts), has to be converted via the Fluid Transposer using Gellied Cryotheium(or something like that), which can only be made from Cryotheium Blend(again, I can't spell that name), for a metric assload of Redstone Flux(and unless you like throwing Florbs of that stuff, that's all you can use it form at the moment), and Cryotheium Blend needs Blizz Powder, which is made from Blizz Rods, which I have no clue what drops them(their Wiki sure as hell doesn't know either last I checked), or made from snowballs... in the Liquid Infuser, using 200 mlB of Destabilized Redstone.
And that gets you enough Gellied Cryostuff for 2.5 Cinnabar Ore Blocks to be made into TE3 Cinnabar. Massive costs and time needed, not to mention Infastructure, for a way to convert a essential resource from one mod into a useful resource in another(but ultimately not needed).
Or you could just do the smart thing and get a silk touch tool via any trick you want and "suffer" the 25% chance to get some cinnabar for every redstone ore block you pulverize.