Hot seat games are like single player games but played against another human..

You have to add this to your preference.cfg file if you want to play hotseat campaign..

[multiplayer]
playable = true
hotseat_turns = true
hotseat_scroll = false
hotseat_autoresolve_battles = 1
hotseat_disable_console = 1
hotseat_disable_papal_elections = 0
hotseat_save_prefs = 0
hotseat_update_ai_camera = 0
hotseat_validate_diplomacy = 1