Well in all seriousness, all house rules are essentially Rule 0. You can solve this by adding the line "This does not work with the Uplifting Primer as an improvised weapon" and call it a homebrew, but at the end of the day, it's still Rule 0.
Alrik, in all seriousness. I asked what people have done other than invoke rule 0.
If you really want a rewording of the rules text (which is an entirely valid wish; I myself would want to do so, because I'm (slowly) working on my own homebrew and I want clear rules texts), then I'd just go with my aforementioned solution. The fact that you can still arguably pin a single person with your book or pebble is only representative of you being crazy enough to think it'll work, and the guy jumping out of the way.
This. This I'd love a concrete answer to. Or a solid suggestion as to how to resolve.
As for your other reply, that's exactly what we have been discussing in this thread. Let me reiterate - you do not attack targets with suppressive fire, you designate an area and bullets go everywhere within it. How do you stack the penalties if targets are at different ranges and different sizes?