Hey Anna,
With the way the KittyCats "genetics" works, this is simply not possible. They have TWO "genes" per trait you see, nothing more. -And if you know the hidden fur of your KittyCats, and breed specifically for that, you'd be PISSED if that was suddenly another fur - maybe one you don't want at all! -Besides it not being possible, it would create an uproar from people who know the hidden traits of their cats and spent generations on breeding for those specifically.
-If what you suggest should happen, it'd take a completely new way of breeding the KittyCatS, "mutations" etc. included. -If that is what we want, we may as well breed Meeroos - their way of passing on furs is WAY more complicated than KittyCats (Seems damn random at times

), PLUS they already got "mutations" implemented in the scripts. -It is a completely different system.
Both systems have their good and bad sides - but I believe KittyCatS work great as they are, EVEN if it means that new traits cannot be added to old cats.
KittyCatS are fairly simple creatures - and once you know your cats through generations, also fairly predictable. -But yet so brilliantly simple that they can STILL surprise us, even when we thought we knew it all

Let's keep it that way - even if it was possible to change it AND the creators wanted to, I am sure it'd cause more trouble than it'd solve if it was tried.
That being said, I like your expression "Tsunami of traits"... lol. -Yeps, we've had MORE than a fair share recently, and we haven't even uncovered them all yet. I agree we need a break on that front. Let's unveil what is left to be unveiled, and get a chance to combine what we then got in the way we want before even more options are thrown at us.
Saga