Hi Terry,
No, actually I had thought you had added the arrows, never saw them before. They might be something new in the the beta. As far as the weapons, that is all in the arena settings, not the mission editor. See Mongoose post in the custom arena forum on how to save different arena settings. Note that in the mission editor you can specify a custom arena setting by saving under a different terrain name and specify under File/Mission properties. I find it convenient to turn the ack way down.