I think there should be a Double Points for training week. I love training but I takes way too long to level them up once you pass Ancient! If its possible maybe a Ultra pet snack that gives 100 points. I don't know about everyone else but I would love some extra help.
That is one of the member benefits offered from time-to-time. It should be coming up on the rotation soon as double gardening rewards just ended.
I would love to see new snacks though, kind of like your idea. Snacks that you can't feed to your pet until they're a certain level. Like you say, maybe 100, and they have to be at least ancient before you can feed them.
Training is so boring and tedious. I wish I knew what the benefit was to KI to making people keep repeating the same games over and over again; to understand why it's necessary to put us through that. Mega takes so long, and Ultra I don't even bother.