O2 simulation with custom generator (similar to AliGenParam)?

Hello Experts,

I am new to o2MC. So, could you please point me to any document (e.g. ppt) / webpage where I can find the syntax for all the O2MC workflows (for default setup)?
Then, I was wondering if it is possible to have o2MC with customised generator (similar to AliGenCocktail, AliGenParam in AliDPG) where I can inject specific particles with specific pt - eta range ? Also, is it possible to fix the vertex position at a certain Z-vertex (similar to AliDPG)?

Thanks a lot in advance.