I'm afraid not. People are as active as they can be, or as they want to be. What you are suggesting would increase DEMANDS on activity, which is not the same thing. Basically people would have to be more active, or they would die constantly. Which would result in a lot of people dying constantly, becoming frustrated, and giving up playing entirely.
It certainly wouldn't help new players because the game would be much faster, activity would be much more important, and they would be getting killed even more than they are with 10 minute ticks. This would lead to a lot of new players quitting.
There was a mini round back around round 29 which was half the length of a normal round, I think, and although the chaos was fun for some people, it was far too intense to be made a permanent fixture.
If anything, I would say it is a better idea to slow the ticks down to 20 minutes. Not that I'd support either change. 10 minute ticks are fine.