More idea sharing please! Maybe something will be possible and make a nice feature for nobl 
If NOBL wants a new type of PoS to separate itself from the rest - go for a variable interest rate based a new parameter - maybe called resident age or something. The longer you hold noble within a certain coin address without exchanging it elsewhere, the more interest those coins gain. I would say give it an exponential equation and then cap it at a certain amount. This way the most benefit is from holding very long.
While coin supply will never be capped, if you constantly record data and track inflation, these parameters can be tweaked to ensure reasonable overall coin inflation rate. And this should be made clear up front that the first 1-2 years are experimental years and that the interest rates will be tweaked periodically (say every 6 months). Then you can work out how to get to 5 billion in the remaining 3-4 years.
With a market cap of $50K, you have a lot more room to look into making some drastic changes.
Anyway, just my idea. I would love to see some coin do this and I don't believe any PoS coin yet has.
