The training modes can be set by card individually - so each card can have another training mode.
Currently it is not possible to change modes only for cards belonging to one list, but of course you can change the default training mode and add the cards to one list and then change back when adding to another list. Just remember not to use "apply to all cards" when changing the modes.
We plan to allow changes of training modes for lists of cards (using the website). Such feature hopefully will be available before Christmas (2014)