Hi Dushyant,
In answer to your questions:
1) Your observation is accurate, the Adhoc Analysis template has been deprecated as of Design Studio 1.6, in preference for the Generic Analysis template. If you want to apply the same type of filtering as shown in your Screen Shot 1, then simply add the Filter Panel component to the template;
2) If you want to skip the data browser on start-up in order to use the hard-coded data source, it should be sufficient to comment out the "DATA_SOURCE_FUNCTIONS.open_source_dialog();" statement in the on_startup function of the START_FUNCTIONS global script object as shown in the screen shot below:
You should also change the Load in Script property of the data source from true to false.
Regards,
Mustafa.