I've been putting some thought to this. I have 7 varieties of peppers that I do NOT want crossing, but do not have the space to assure that they won't. So, I wonder if I could bag some of the flowers, starting when they're just a bud, then manually pollinate them, and cover them again so that nothing else can bring in "bad" pollen. I would only need to pollinate a few flowers of each type to be sure that I have enough seeds. You would, of course, have to be very diligent with it, and you'd have to make sure that you keep the seeds seperate from the randomly pollinated ones.