The views component includes a slider to increase/decrease view rotation times. Go to --> Views --> Click "Start Rotation". A slider should appear on the far right of the views iframe. Use this slider to adjust the rotation speed.
Former Nagios employee
"It is turtles. All. The. Way. Down. . . .and maybe an elephant or two."
VI VI VI - The editor of the Beast!
Come to the Dark Side.
Ah, missed the second question, my answer follows: No. Not yet, maybe someday, but not yet. It can be done, but is not fully persistent through upgrades, and requires livestatus. Oh, we also don't officially support updating Nagvis outside of the XI installed and supported version.
Former Nagios employee
"It is turtles. All. The. Way. Down. . . .and maybe an elephant or two."
VI VI VI - The editor of the Beast!
Come to the Dark Side.
I made a feature request to update Nagvis some time ago http://tracker.nagios.com/view.php?id=423. Maybe you could +1 it. If more people want the Nagvis upgrade, maybe Nagios XI developers could get some time to implement it...