Q: Is there a method to migrate current rules to a new server?
A: There's no current process for this, no. It is something, I'm sure, that R&D is currently working on.
Q: Is it possible to get the license number into a custom property?
A: It would probably be easier to make a license based rule.
Q: There is some best practice documents about setting up security rules ?
A: Help.Qlik.Com has a plethora of resources.
Q: Is there a possibility to restrict users within a stream to different apps - Like for AppA i want users ABC & XYZ and for APP B i want users DEF & GHI with in one stream itself?
A: For this scenario I would use Section Access.
Q: Is it possible to apply Security rules to specific UI components (tabs, charts, etc)?
A: Not with Security Rules, but you can do this with Section Access.
Q: is it possible restrict user access by time of the day ?
A: I've thought about this a lot, and I've come up with the answer of "probably". I've not been able to actually do this yet, but you should be able to use a custom UDC with time based values which you can use to give/prevent access based on that value.
Q: Can we control the number of objects that the users can create with in the app when a user is a Contributor?
A: No. You can turn it off or on, but not control based on number.
