In these cases I think it would be better to snap images with an APS instead of an F5 with dual flash. it's less intrusive, and it doesn't generate the idea of a "professional going for a shot".
The difference between not shooting an image because of ethics and humanity (not a bad thing =) and shooting an image with a tiny camera that will not be found offensive, is still an erntire celluloid exposure, which will be able to trigger memories afterwards.
Shooting in this case with a small APS is still better than not shooting with a "small" SLR like the Pronea S (which has, agree with me, the cutest flash in SLR-country). Perhaps something like the new lite-touch zoom 120ED or something. Maybe an Ixus would be better (read: smaller) still.
Okay.. umm.. now hold on there JRP, I know what you're thinking and I'm not a kwanon sympathist! really! this is not about SLRs, but APSes.. right? You know it makes sense! now don't lynch me