For the first question: There is actually copyright on the text of patent applications (and the drawings), so if it is not your patent, no. (EDIT: see comments, this answer to the first question might be wrong)
For the second, I'd go with the second sentence as using personal pronouns is bad style. But something like "concerning this feature, an additional measure to increase user compatibility would be to turn up the volume". Your sentence hints that not increasing the volume might be bad and depending very much on the circumstances and the rest of the patent you might end up having to take the increasing volume into the respecting claim.