I would like an option where you can allow the player to decide wether to mulligan. (I mean, in the options menu, add an "allow auto-mulligan yes/no" or something)
It does take a long time before a PVP match, and thus it is unneeded in common games, but in important matches (for example, warmatches) the players should be able to decide for themselves as correct mulliganing is skill-dependent.