I have shot a HUGE number of "candid" office portraits for brochure work in the past couple of weeks. I did it all with just the cam and flash with adjustable head.
(Sorry, I am not familiar with the Canon flashes. I used a Nikon SB-800.)
I have a flash bouncer, but I've found that it's too much when you're right up on someone (like in an office), so most of the time I just bounced the flash off of the ceiling or a wall, using natural light when I could.
I definitely wouldn't try to take in lighting. It will make the person much less comfortable, probably make them hot (and sweaty...ew), and you don't want to have to spend a lot of time setting up. A ton of setup time leads to less spontaneity (and candid-ity, if you know what I mean).
And while they want "candid" and not "posed," chances are that you are going to have to do some posing (corporations seem to like pictures of people pointing at monitors and stuff...I still haven't figured that one out). So I would spend some time with a willing stand-in and shoot them from a variety of angles, then flip through those photos and find out what you like. That will let you slip in and out of the shoot really easily.
Anyway, those are some thoughts. I had this one client who wanted me to come in and shoot their "control room" like 3 times in the last 3 weeks (long story). It got to the point where those people absolutely hated me and ran away when they saw me coming. My last time in there, I rented a 400mm lens and snuck shots of them from far away when they weren't looking
rob
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