So here's what I propose, allow players to have 7 heroes, but only if they have both NF and GWEN and did a number of quests to earn the right. For example there could be a 7 level leader of heroes title and with each level after the 3rd you gain in it, you can have another hero in the party. It might have added benefits as well such as slightly improved hero AI or some such thing.
At the least this would encourage people to buy GWEN and NF if they don't have both.
