Ilya Ber

Indeed, many users implement htaccess password protection on the Revive admin folder.

The Magic of the Macros

Determine the current browser resolution and load an appropriate zone based on that using JS. 
 
Even easier, if you are using single call invocation, you can just pre-populate the Zone ID list  - here is a good example. 

Third Party Clicks Tags: http://blackriver.to/2014/01/openx-source-revive-adserver-party-click-tracking/
Click URL and other macros: http://blackriver.to/2014/01/openx-source-revive-adserver-magic-macros/

Determine the current browser resolution and load an appropriate zone based on that using JS. 
 
Even easier, if you are using single call invocation, you can just pre-populate the Zone ID list  - here is a good example. 

I would suggest using the awesome Zone Chaining feature. Basically, you can chain a backup zone to your main zone, and if there are not banners available for display in the main zone then banners from the backup zone will show up.
 
You can do that on your zone editing screen like this:
 

There is no feature to let an advertiser user create their own campaign. This is intentional.

Hi,
Based on the campaign weight, ad will be delivered. Whether you mean it..based on the campaign weight and associate country, ad need to targeted?

IIRC, your default banner cache setting is 20 minutes, you can either set it to something less for testing purposes, or you can simple empty the openx/var/cache and it will regenerate on the next banner load. 
 

Best to create separate accounts for every program, this way your metrics will stay separate as well.