I thought I would keep things short and simple today and answer this for the author.
1) Average time for getting back is about 2-4 weeks. I honestly hate when submissions stack up in my email so I do really get to things quickly. When I start getting to that 1 month point, I personally start to freak out a bit.
2) If the submisson is an initial response and I want more material, I do have a form answer. More often than not, I have standard answers I give, but I do write a brief letter for each submission. I do not agree with the premise some agents (and editors) have that say, no answer means a no. Personally, I think this is unprofessional.
3) I take submissions from anyone that has a passion for writing romance and women's fiction. Authors can be both published and unpublished. In fact, with the exception of 3 of my current authors, all were unpublished.
Hope that helps!