put on T'fillin. Of course they can, under Halachic conditions, but not just anywhere, and not in a quorum with men. Indeed, there are women that hold services "among themselves" on Shabbatot, but separately. Dont know enough about the details, but there is some way of dealing with issue. In any case, the traditional point of view is that you are credited with doing things that you are obligated to do. Yes Virginia, there is not voluteering, as such except in in the case of Hidur Mitzvah, which is quite another matter. It is unfrortunate, but true Halachah as it is explained in the "Revealed" version doesn't always fit with the spritiual needs of all of us, men, or women. The usual answer you get from such authorities, on some issues is we don't know enough., and leave it at that.
Neurologist and author Oliver Sacks dies at 82 (Haaretz)
from the article: Why the shock? SAR school let girls wear tefillin 20 years ago