Agree with SG on this.
Don't tamper with things, the game is in a perfect balance.
Add one new rule or remove one current rule and the game becomes
unbalanced, odd, not right. It would create a domino effect that would
ripple through every aspect and phase of the game and destroy it's beauty.
Although the Spanish lads at the Royal court re-invented the game
we play today by improving the power of the Bishop and the Queen.
I sometimes think some kind of of unseen power had in it's influence in
this matter. It's the perfect game full of enigmas and chamring possibilities.
It's far to perfect to come from the mind of mere humans.
This is a draw. White to play
Add just one pawn.
Now it's a win.
One thing I'd like to see, not a rule change how the game is played,
that is sacred.
But a rule stating a player cannot resign.
The game must be played out to a Mate. Which after all is the object of the game.
If you want to resign then create a sui-mate like I did in
Game 7573011
(see below, I'm White, a piece down so I constrcuted a self-mate).
It's never going to happen but often think a tournament with such a
rule would toss up some imaginative and amusing mates.