1. I don't fully understand the question but I suppose you don't want the enduser to be able to copy-paste outside the app? You can use the mobile access setting under "Capsule Workspace Settings, choose your used profile and then under "General" you can uncheck "Allow sharing of data outside of the Capsule Workspace container". If someone then tries to copy paste elsewhere, they'll get "Pasteboard secured by Check Point";
This however does not help against screenshotting the current view.
2. No, I don't think you can change your AD password, only PIN/Passcode of capsule itself.