You may not be an Android user as I am, but if you are --- im excited for the V2 scheduler in Ankidroid, which will allow you to pull in cards from multiple sub

You may not be an Android user as I am, but if you are --- im excited for the V2 scheduler in Ankidroid, which will allow you to pull in cards from multiple subdecks when reviewing a parent deck. The desktop client already has it. If that is added, or you're already just using the desktop client, then IIUC the feature you seek (1 new concept, per category, per day) could be acheived by setting the "new card" number on each deck to "1", provided you've separated each of the concepts into subdecks of a main deck.