"TCP/IP-hotseat" would not be feasible with more than two players, because everybody else would have to wait for two combattants to duke it out.
For two players, it would be a nice-to-have feature.
Somewhere on this forum there is a thread that deals with a SE4 Arena/Battleground idea for tactical combat only. Nice to have for a quick round of tactical combat with "one of the guys" during your lunchbreak
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Rollo