Problem is that the opposite can also happen, you trigger a lot of auto fire and then we have people complaining about that.
I know it's a hassle to game in phases, I can only suggest to do small scenario online. A secession on the weekend might allow you to finish such a scenario right away. And the large ones are not so bad in phases as people tend to need days to do a complete turn while they are able to do the smaller phases on a daily base.
As for the exchange, maybe file exchange via
www.dropbox.com would be an option. at least the boardgamers use that or similar services for their exchanges.