There is if you have an action replay, sort of. It gives you all of the course stars, which is 120.
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Apparently, yes. I've done it before. BUT you need R4 for DS. Just go to the cheat screen on R4 and turn on that cheat.
There are a total of 30 secret stars.
Get action replay while you have all 150 stars. Use the action replay code: CUSTOM LEVEL. Talk to one of the Toads. He will give you a star!!!
There is no cheat for this game.
Here is the cheat for 240 stars: 020960F4 FFFFFFFF 020960F8 FFFFFFFF 020960FC FFFFFFFF 02096100 FFFFFFFF 02096102 FFFFFFFF 02096106 FFFFFFFF 0209610A FFFFFFFF 0209610E FFFFFFFF 02096112 FFFFFFFF 02096116 FFFFFFFF Tested and works!