Content Add Ins (office.js) are great to present Individual content in PowerPoint. To benefit even more add the possibility to use the Content add ins interactivity in Presenter View which means you...
At the moment click or keyboard input switch to next slide.
This input should go to content add in to support a similar behavior
as other embedded media e.g. start/stop a media file in PowerPoint.
I also recognized that laser pointer and pen will not work on office.js content add ins in PowerPoint. The add in is always top most - the mouse pointer etc. is below.