For the first one: Wouldn't it be better to use the secondary scoring method? 10k points really isn't that hard to get with the normal one.
It's a sound idea, but really it needs refined & more work/discussion made on it.

As for the second: That would work best if it was only allowed or mods with a trigger setting for win/lose. In the case of parkour there should be an area that is considered the end and reaching it first = win. That's something that can be set in the mod, though the games total frames (currently) dictate the end of the game.
Having an endless turn mode would need to be locked down to mods that use triggers for the winner/loser; which would make it useful for all kinda of different game modes.
There is the downside that there's a limit to how long a replay can be, but once again it's a sound idea on paper.

Discussion required to "develop" the idea further rather than supported posts PLS.