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This is coming from someone who personally devised tactics for games with a small time control. The timer is no longer an element of gameplay for him. I won't even comment.
Nevertheless, all of this is not part of the gameplay. More precisely, it is not part of the "physics of Heroes," I think this term is more appropriate in meaning. It is the "physics of Heroes" that should not be changed. But the organizational component (including the template, difficulty level, timer, rules for choosing castles, etc.) can be changed as much as you like.