Yes, there's an option in Jamba (checkbox) to "override when a stranger joins team" or something similar, right underneath the FFA option.
As for keys not working, can you still jump/sit/emote? If those work but your spellcasts don't, then it's probably a problem with your assist/focus/targeting macros. [edit] Note that if you use @party1, @party2, etc. in your macros, they won't work the same if someone else joins the group. Well, they might, but they might not. If you're having @target/@party1/focus problems, try typing /target @party1 or /target focus or /assist focus and such in the chat box and see what it does. Might give you some extra data to work with because if it works from the chat box but not your macro, then your macro is broken.
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