Penalty Time - a fairer system for tiebreaks?

The problem with the World Championship match format is perhaps that the leap from classical to rapid games in the tie-break is a leap too far. It is not a bad idea to play more games per day more likely to produce an outcome, but 25/10 is just too far from classical chess to provide an outcome that sits well with the chess world.

There is also another, at present unmeasured dynamic in the longer games that could be captured in game scores to produce a result. Each time a player was struggling in the first 12 games, he got behind in time. Should a player be rewarded equally for struggling to a draw, as against dominating but not quite winning? I believe there is a fair way of capturing this dynamic that could be introduced in a longer format tie-break section.

What I would suggest is this:

Play the first 12 games as was done in London. This worked well, apart from not producing a result. Wonderful chess was played, that accurately captured the equality of the players, and the interest of the public was sparked and maintained.

For the tie-break, introduce something new. Two games per day with time controls that introduce a new concept - Penalty Time. Allow 90 minutes for the game with no move increments, with an optional 30 minutes of Penalty Time, where for each 10 minute block of time you begin, you are penalised 0.1 points from the final game score.

Some examples of Penalty Time results: The score in a drawn game where black used one 10 minute block of Penalty Time would be 0.5-0.4. The score in a game won by white where white used two 10 minute blocks of Penalty Time would be 0.8-0. And where the loser has used Penalty Time, negative scores would result.

There will be no format that shortens or alters the classical game format that meets with universal approval. I believe this concept of Penalty Time, however, has the potential to on the one hand allow longer games to be used in a tie-break format, and on the other hand introduce a system more likely to produce a clear and fairly decided winner.