Hey,
Good ideas here.I think ladder system should be better if you guys going to create more than two leagues.Actually,God2k was going for this 2 years ago but he didn't find some coders to do that.
For an example:Default Ladder,include default schemes;Elite,Intermediate,Team17,BnG,Dabble,Hysteria,etc...
Rope Ladder,include rope schemes;Roper,Rope Race,Variation of Shoppers,Wascar,Bungee Race(xD),etc...
Pro Ladder,This is mix of Default and Rope Ladders.
You can also add Fun Ladder,There is many funny schemes for this like BnA,Boom Race,Battle Race,Mole Shopper,Golf,Wfw,Plopwar,Jetpack Race,etc...
But some schemes should be arranged to play fair in the league,like Hysteria,Dabble,Intermediate(NNN Luckless would be cool),etc...