First, asking about telecommuting or pay & benefits should come at the very end, really after an offer is made. You don't want the focus to be on what benefits you will be receiving, you need to focus on why they should hire you and what you offer to them.
If you have a concern about progression, it's perfectly acceptable to ask about career opportunities during the interview. I'd focus on opportunities within the group rather than outside the group. Put yourself in their shoes. Why would they hire you if you stress you want to move into another area or do things outside of the core focus of the job?
An interview is all about what you can offer them and why you are the best candidate, not about what you will get out of the deal. Focusing on benefits, pay and perks like telecommuting are best done once you have an offer in hand.




