Well, something like this could be always implemented as an additional mode, so you still get to play your favorite style I guess. Though, if such rules/modes would be introduced, that probably should be done in a one-catch-all fashion, so you may toggle modes for all games (pvp, ai4, ai5, fg, ...).
Sounds like a plan, no? IMHO the "bureau" or the main screen of the game needs an overhaul anyway. Quite a mess it is. The option to upgrade cards for instance is completely missplaced, and with new quests coming, something has to be done anyway... So why not plan for a small mode-panel/gadet to set these settings?