Warning: Lister obsession triggered. Rampant fanboy gush to follow:
The times I saw someone execute this manuver, they dumped the peanuts in the bottle and drank it normally. Peanuts were chewed as they cropped up, much like the tapioca in bubble/boba tea. I have not tried it myself, so I can't say whether it would go flat quicker or not.
I don't much care for cherry vanilla Dr Pepper (Vanilla is eh, and the cherry isn't very powerful), but I miss Red Fusion something awful. It improved my soda by adding cherry (good) and taking away the caramel color aftertaste/stickiness (also good). When they stopped making it I drove many miles to buy out the remaining stock of it -- ended up with about three months of extra cherry deliciousness before I had to give up.
Also, Dr Pepper made with real cane sugar is far superior to that made with corn syrup. This is how it is made in Great Britain, which is probably why they call it that. Here in the states there's only one bottler that makes it that way, in
Dublin, TX. It's
almost worth the shipping cost.