Like rockets, grenades and molotovs are not allowed in LWs and some weapon restrictions which is the real taste of littlewhiteys. So chainsaw shouldn't be added as it is also overpowered like those, in my views its more powered than molotovs/grenades as they just lower a bit Hp but if chainsaw is used skillfully in close, it can kill in just a second.
So -1. Just to keep the littlewhitey's game level as it is.