It's been raised many times before, but I guess there's no harm in doing so again. To be truly powerful FoW reveal needs these:
- Square / Rectangle
- Polygon
- Circle / Ellipse
- Wedge / Cone
- Free Form
With only the Square / Rectangle reveal that we have at the moment, I am deeply regretting putting octagonal and circular rooms in my current dungeon (actually a hollowed out asteroid base). Revealing those is a major chore! :-)