Is Yacoin the only coin who tried to change Scrypt parameters?
I think there is ybcoin doing that now as well but their release mentioned several coins I didn't try to sort it out.
I think ya-coin integrated scrypt-jane into the codebase (that's a library) and there have been a couple of efforts to mess around with it since. You might search around for references to that, as there was some confusion around here with people thinking that scrypt-jane was the name of a hashing method.
I thought there was another coin in the last few weeks that required the wallet miner at release but I can't be bothered to search right now.
At this time, it's pretty well understood that botnets are going to eat any coin that doesn't have a GPU mining implementation, yeah.
you could substitute "server-farm" for "botnet" same difference to the people that seem to want a coin no one can mine faster than them