This seems like a great idea that could be way too difficult to implement to exist any time soon. Maybe someday! The trainer is probably an area of the game where it wouldn't hurt it to add tons of customization/options, even if it got really complex to use. But, then again, the game itself still doesn't feel complete to me (the total cards still seems pretty small, and lots of other issues still exist), so I would prefer in-game updates to trainer improvements for the short-term
