Hey!
Do you mean something like, having a crisp 1px tracing of a layer's masks similar to the "stroke" effect(from the effects panel: "Generate>Stroke")?
If so, this is precisely something I have on my backlog as well as I too want to have crisp vector-animated paths in After Effects too!
Good to see that others desire this too so I'll be lining this up sooner. Keep a look out!
Also, thank you for using PixMap! I'll be releasing a new total-refresh of PixMap very soon that is GPU Accelerated called B.Map!
Look out for that too!