I think "fee dividend" is probably about the best one (it conveys the idea that you get something because of your investment without the idea that that something "comes from nothing").
Yes, that is pretty good. Also due to the variability each person gets a different rate, easier to understand the rate difference if it is a dividend (which is expected to vary) as opposed to interest (which is expected to be stable)
My issue with using the term "interest" stems mainly from the fact that the paragraph starts out talking about bitcoin, and how it doesnt have interest, and how NXT does. but really its possible to mine for transaction fees in bitcoin.
I think one thing the whitepaper doesnt touch on and which may be appropriate for this particular section we are discussing is how with NX, your balance is what mines for you, not ASICS. (since you are discussing deficiencies of bitcoin)
Feel free to swipe some more material on the article that I wrote for bitcoinmagazine that still hasnt been published. https://forums.nxtcrypto.org/viewtopic.php?style=1&f=2&t=276
And Ive created a wiki board in forums.nxtcryto.org and also put a post in there for us to offload whitepaper discussion from this thread
https://forums.nxtcrypto.org/viewtopic.php?style=1&f=55&t=564