R.,
I think it's fine to use a pacifier, but it may not be the best idea to form a habit of putting your baby down to sleep with it.
Suggestions for getting her to sleep better/longer: Dr. Karp's Happiest Baby on the Block (DVD and book) is very helpful. I recommend the DVD (the book is fine but pretty redundant). His "Five S's" helped us with our daughter (shushing, swaddling, sucking, swinging, and I can't remember #5!). Also, feel free to put your daughter down to sleep wherever she sleeps best: in her infant seat (strap her in if it's on a surface other than the floor), a baby swing, the car, a baby carrier, etc. Newborns like to be held and to feel enveloped. Our daughter slept in her infant seat, swaddled (even at night) for several months. As for the stroller, eventually she will become less sensitive to bumps. For now, you could try to pick a less bumpy route, or just tilt the stroller back on it's rear wheels in anticipation of the bumps (makes for a somewhat smoother ride).
Eventually your baby will learn to go to sleep on her own, but it takes time. For now, just do whatever you can (as long as it's safe!) to ensure that you and your baby get the most sleep. (You can also try co-sleeping, but I would recommend reading Elizabeth Pantley's "No-Cry Sleep Solution" where she lists important safety precautions for cosleeping. And as long as you don't use heavy blankets or pillows, you can definitely lie down with your baby for a nap!)
All the best,
R. S.