Artax_EU

Hi, I'm trying the mastermind class, and I have some questions.
- If I put a Range enhancement on an henchman Upgrade power, does it boost the henchman itsel (i.e. he will be able to shoot at extra range), or does it allow me to buff my henchman from further ?
- Are the Leadership powers (Maneuvers, Assault, Tactics) cumulative if two characters in the same group have this power ?

Thanks in advance if you can help me.