no its not possible, if you mean he does the triggers and you do terrain and it merges at the same time. The would make map making that much more convienient and easy.
The way more than 1 person works on the map is that one person does the first priority job first (e.g. Terraining then triggers), saves the map, then sends it over a website or a messenger program.
Might I suggest using This Website for uploading if messenger sending isn't too much of a possibility.
I'm on a page about incorrect corrections, and spent the better part of like two hours trying to get someone to understand that -5^2 = -25, not 25, and then that post had comments get reposted because that group is self sustaining, and that person was in turn trying to explain what I just explained to them. And I'm taking that as a victory
I will be AFK for a couple of days you guys hold down the fort while I am gone. I will be checking in on my phone but that will severly limit me. Be back saturday!