I have installed DBo Afghanistan (http://www.armaholic.com/page.php?id=18805) island, leaving Stratis unmodified, just to check it out. I played on this island, then I entered two multiplayer servers and got autobanned on each instantly.
Having to delete all mods before playing online is just ridiculous. I mean, obviously anticheat should detect modification of current island and gamemode, but not blindly ban for any mod I have. What if I have 1000 islands, just in case? I should remove all these keys from steam every time I want to play on original maps, and add them back every time I want to play mods? Or download some third-party launchers to do it for me? Would be much simplier just to fix it up, so only current island and mode is checked.