Again, what's the big deal if you are playing Multiplayer and one player triggers combat which then forces all players into turn-based mode?
1. How often are you going to play multiplayer and NOT be traveling together in the same group?
2. Even if you do, it makes no sense that player 1 is suddenly in turn-based while player 2 is roaming the map willy nilly. It's a turn-based game, not MMORPG or RTWP. In turn-based, 1 person is in TB, everyone is in TB. Again, you shouldn't be able to run from the toll house to Ethel's lair in a single 6 second round.
3. Not pausing the world when you enter TB messes up a ton of game mechanics.
For the sake of the overall game, they really should just pause everything.