That's not making up your own rules. Match play rules allow a player to concede a stroke, a hole and a match.
Perhaps the next time you are browsing through the Rules of Golf book, you take some note where it mentions something different in match play.
It's not gentlemen's golf, it is a serious contest played by gentlemen according to the rules. If you know the rules, you can use them to your advantage.
I was taught give you opponent the first few putts, to give him a false sense of security
Then when things count make him putt.
Same with the way you play the game.
Matchplay is huge in every club
I have been taught by some cunning old dogs
Thats all the help you mob get incase we meet in matchplay one day