Different sidebar for WordPress and BuddyPress pages functionality is already present in InspireBook. In Theme option panel (Navigate to
Appearance > rtPanel > General), there is setting for "BuddyPress Sidebar" in Sidebar Settings. You will need to select "Enable BuddyPress Sidebar" in provided option and click on Save All Changes.
Now navigate to Widgets option page, there you will see the extra "BuddyPress Sidebar Widgets" area. Simply drag your BuddyPress widgets into that area. This widget will display only on BuddyPress pages. You can also refer our screenshots for above changes.
Also about #2 and #3 point, this is part of customization, and we will look into it later.