A significant advantage of existing cryptocurrencies is that the key attributes were made fully public up front, held constant, and not politically revised by any party (so far). If you start making up the rules as you go along, you've just created a less centralized & possibly more democratic, but still politically manipulable, imitation of a Central Bank and fiat currency. Maybe there is demand for that, maybe not, but if you want that, you should at least have the decency to launch it as a new coin, rather than corrupting an existing one.
-rph
Novacoin changes stuff around, they think nothing of screwing around with interest rates for example, setting them nice and high knowing their cronies won't object as long as they plan to change them back low again once they and their cronies have gained lots from the high interest.
Gosh knows what other screwing around they might decide at any moment to do.
-MarkM-