Pixel motion blur

Does Fusion have Pixel Motion blur, that doesn't need a vector pass?

Optical Flow can make vectors for you.

I know, I mean in free fusion

No, Not in the free version

Are there any ideas of faking it somehow?

Not sure what your shot is, but perhaps a DrBl would work?

If you have an object moving quickly, like a propeller, you could make some dummy geometry that matches it and set your 3Rn to output velocity vectors.

[Rohit Gupta]

If you have access to Resolve Studio, you can use the Motion Blur to do this.