I've posted this idea in the past
but it got lost in the crowd (of
silly posts by others :-) -- actually
somewhere inside my own post :-)

In the case of the championship match
the playing tempo should be decided
by the champion and the challenger.
They would not have to discuss and agree
to anything. Thye would just play
according to the simple rule:

falling 90 minutes behind your
opponent on the clock loses
the game.

That's all.

****

Occasionally, the above simple rule
may be applied in other matches;
perhaps 90 minutes would be replaced
by 30.

***

BTW, I never liked the rule that the players
themselves have to watch the clock. Players,
as much as possible, should be preoccupied
with chess only. These days it's the best when
the clock itself tells the players that one of them
lost on time and the game is OVER automatically.

***

Regards,

Wlod