A specific rule trumps a general rule that doesn't talk about the specific rule.
It would have to state a change in the natural weapons use while grappled specific rule...
What you just described IS the traditional "Gygaxian" set up. See 1st Ed racial class limitations.
That being said, develop your world and drop or add any races as you see fit. There's nothing in the rules that says a DM has to allow ANY race.
Timestop is pretty clear. "A spell that affects an area and has a duration longer than the remaining duration of the time stop have their normal effects on other creatures once the time stop ends."
You could also pull the pin on a grenade that has a fuse for 6 rounds and put it in someones...
High end scanner/copiers have a book setting that corrects for that curve. And, you are correct, you can scan any book you own. You can't give someone else the PDF of course.