Does anyone know about this issue and whether Adobe Analytics is impacted, resulting in an inflated average time spent calculation?

Hire an analytics professional.  You probably wouldn't want to spend the cash for anenterprise level solution like Adobe Analytics so I would recommend a free solution like Google Analytics.  

This is a good example of what happens when you have questionable implementation.  It's hard to make sense in reporting from something that doesn't make sense from the implementation perspective.

As the other post mentioned, it's not recommended to use sprop to get details on events.  The preferred method of looking at drivers to events are evars.  The rationale behind this is the persistent cookie.  You would want to look at all evars that may have influenced the conversion event.  Whereas,...

I believe it's in the report suite level.  I would love to help you further but I'm currently not an admin at the company where I consult.  If you're still having trouble and you're a supported user, I recommend you reach out to client care.  Best of luck.

For the the query string parameter to get picked up in the campaigns report, you will need to set this up in the admin console.  You will need to be an admin for this.  Here's an example for the campaign tracking:https://marketing.adobe.com/resources/help/en_US/reference/processing_rules_populate_ca...

I believe you will see the query string parameters in the pages report only if you use the default settings which uses the URL structure.  This happens when you don't specific the pagename value.  The disadvantage is that you may not have the URL structured in a way that meaningful for comparison an...

Thanks for the response and making the point that you wouldn't want to compromise user engagement tracking but I don't think this is the case here.  Just reviewing the current implementation and looking to make the tracking more efficient from a cost perspective.

Is there a way to wrap multiple request into one Omniture call if they don't have any overlapping custom variables?  For examples, we have a call for the link, which is passing only two variables and another for the destination page.  I personally think it's a waste to be sending these types of requ...

Thanks Gizazelle.  I'll let the engineering team know so they can remove the duplicate calls from the codes.