It's been a long time since I've worked on them or owned them, but IIRC MAFAC cantis aren't super sensitive to toe in. Good well bedded pads, clean scuffed rims and good set up are more important. I'd suggest you just let them bed in a bit unless you are having problems. Also, you might be able to swap the front for the back set - in case someone already tweaked some toe in into the arms.

BITD built in toe in adjustment was pretty much non existent. As cave man as it sounds now, you had to bend it in. Doing it all the time gives you a feel for it, but it is possible to break things. I didn't worry about it much when I had a set of these on my touring bike, but they were relatively cheap at the time. I'd be more careful now.