Well i cant scan Mekanism blocks with thaumometer, this is bug or you just dont play with Thaumcraft?

I think there are simply not aspects set to Mekanism blocks.
I've seen that a week ago. I don't know what side (Mekanism or Thaumcraft) should add them.
Also I know it should be possible with MineTweaker 3 (I found a file that added aspects to Botania), but there would be search to get how it works.

Maybe it would be possible to add support using Thaumcraft API?

This is the kind of compatibility I would like to see in a PR- adding block and item-specific aspects is very low priority compared to the other feature requests and issues stacked up right now.

Well, thanks for feedback mate, keep working on mod 👍