Only talking B&W here, and I should not admit it in public, as it might be considered heresy (and I prefer "proper" exposure like everyone else), but:
Recently, I had only one camera with me and the "wrong" film (FP4): I was in an old castle, nice weather outside, great light inside with very high contrast, etc .. so I just changed ISO (or if you want: overexposed or underexposed) as necessary within the same roll, as if I was using a digital camera. Then I developed the film stand development (you know, Rodinal 1+100, two hours, 15 sec. "walsing" the tank every 30 min). All pictures came out fine; some were a bit denser then usual, but all had plenty detail in the shadows, nice highlights and very printable ... I just printed them yesterday evening.
Stefan.