I still dont understand the problem about Snake being Campy???
Snake - C4, Mine, Nades, Mortar, Nikita -> Camp lol
I have no problem with limiting his camping options, but he still should be some kind of a campy character. Snake cant camp with only 1 Nade. He may can with having a C4 before him on platform. A mine under the platform. Then throwing nades and inbetween the nades making an up-smash. But well, as I said, it's Snake LOL. But just turn brawl on and see how long it takes for 1 nade to really blow up.
This + Melee's increased overall Speed = Snake can't camp with 1 nade.
In Melee Sheik could needle camp against some characters. Falco was able to laser camp. Samus is as well very projectile based. I still dont see why Snake shouldn't be campy

(It shouldn't be broken camping anyway

)
I would like to give the 1 nade option a try and see how it works out.
And as for Diddy, Diddy is only so good because the naner gives him that much of options, especially defensive options, because you just cant approach a diddy with a naner in his hand or the chance is high you're going to get hit/combo'd by it :S
Edit: @above: Gaws Bair sucks.
It's much more fun if every character has to be played in a different way. There would be offensive and defensive characters, which seems a lot more fun to me as if there only would be offensive character. There should be ground based and air-based characters. Campy and not-campy characters. Grab-happy and grab-unhappy characters. Characters who have projectiles and characters without. Characters with good and bad recoveries. Characters who spam and some which dont or cant. I think it's more fun to have one character for every option instead of having 40 characters with the same strategies and only having some changes in their movesets. But I guess its Project MELEE so idk :S
Do what you want, it's "your" game, but I as a veteran snake-main can only say, that I dont want to many changes, because other than that, I really love this project, and as I said as well, I have no problem in making his camping less effective, but giving him completely new nades... idk :S
Maybe I should wait until I can test it out... maybe I would like them ^^