Sep 10, 2011 - 3:06 AM
I'll try to answer your questions below:
1) If you enter "Jungfraujoch" or "Kleintitlis" as your destination in the timetable, all options will be shown.
2 & 3) If you settle for a first impression of these towns, it can be done. In that case you would just walk across the town centre, see some highlights, and skip time consuming things like museums, boat trips and guided tours.
4) You'll be traveling all across Switzerland in a fairly short time, so regional passes would not work.
5) It can be used for most, but not all rail transport. Just check the map linked from the Eurail Global page
6) Eurail provides less discounts than a Swiss Pass: just a few cable cars are covered and no museums for example. All details are on that same map.