Some stuff i would like to see in new expansions or mini expansions (mainly for campaigns):
- secret passageway, would be nice if heroes would be able to search for secrets, basically make use of prolonged actions or by simply spending some movement points like usual and don't make it too obvious by using question markers where to search.
- more location, dungeons, plots etc. cards for RtL and now SoB to have more replay quality
- more use of counters/tiles of expansions for RtL and SoB if releasing more locations/dungeons (boulders, crushing walls, darts, you get the idea).
- if possible, more riddles in quests
- maybe castle tile maps, house, hut, tavern, city
- make more use of npc's the heroes can visit/find in dungeons, outside encounters, island encounters and so on to simply interact with the npc wether it be for a small shop, or a new rumor, quest item, a new quest in general or just to have a silly conversation with a possibility to get new hints for something like a riddle or an ongoing quest.
- more objects to interact with, be it more furnitures, levelers etc.
- maybe some kind of weather system for the campaing traveling
Basically more of everything, make use of everything, and much much more i can't think of at the moment.
Most of the stuff above i could do on my own, but i like to have original FFG material.