Gert
I also agree that changes like race length should only happen in between seasons and a good host should not decide this on their own but make a poll and ask the rest of the league. But unfortunately a certain % of the league hosts seem to be little dictators so I like the suggestion to disable these changes while a season is ongoing.
This is the reason we run our league as we do, as Paul mentioned we put everything to a vote, even the length of the off season, which 9/10 times is 5 days lol. Running a league this way allows all members a chance to get their vote across and the majority wins, yes its impossible to please everyone no matter what you do you're always stepping on someones toes, but having any league changes put to vote makes it the fairest way to deal with it.